diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..87e5dfe
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,29 @@
+THE FOLLOWING LICENSE APPLIES TO ALL SOURCE CODE PRESENT IN THIS REPOSITORY
+
+Copyright © 2021 KikooDX
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the “Software”), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+THE FOLLOWING LICENSE APPLIES TO ALL LEVEL ASSETS PRESENT IN THIS REPOSITORY
+
+Copyright © 2021 KikooDX
+
+This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.
+To view a copy of this license, visit http://creativecommons.org/licenses/by-sa/4.0/ or
+send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..6f8e6d5
--- /dev/null
+++ b/README.md
@@ -0,0 +1,6 @@
+# Painfull Success CG
+
+## License
+The code is under the MIT license.
+Levels and colors are under CC-BY-SA.4.0.
+See LICENSE for more details.
diff --git a/include/conf.h b/include/conf.h
index 824bb9d..99241d8 100644
--- a/include/conf.h
+++ b/include/conf.h
@@ -1,3 +1,9 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright (c) 2021 KikooDX
+ * This file is part of
+ * [Painfull Success CG](https://git.sr.ht/~kikoodx/painfull-success-cg),
+ * which is MIT licensed. The MIT license requires this copyright notice to be
+ * included in all copies and substantial portions of the software. */
 #pragma once
 
 #define TARGET_UPS 60
@@ -8,3 +14,5 @@
 #define LEVEL_SIZE (LEVEL_WIDTH * LEVEL_HEIGHT)
 #define DRAW_OFFSET_X 70
 #define DRAW_OFFSET_Y 0
+#define PLAYER_WIDTH 12
+#define PLAYER_HEIGHT 12
diff --git a/include/input.h b/include/input.h
index acd0228..912c8c4 100644
--- a/include/input.h
+++ b/include/input.h
@@ -1,3 +1,9 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright (c) 2021 KikooDX
+ * This file is part of
+ * [Painfull Success CG](https://git.sr.ht/~kikoodx/painfull-success-cg),
+ * which is MIT licensed. The MIT license requires this copyright notice to be
+ * included in all copies and substantial portions of the software. */
 #pragma once
 #include <stdint.h>
 #include <stdbool.h>
diff --git a/include/level.h b/include/level.h
index 4a8ca8f..45cb45b 100644
--- a/include/level.h
+++ b/include/level.h
@@ -1,3 +1,9 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright (c) 2021 KikooDX
+ * This file is part of
+ * [Painfull Success CG](https://git.sr.ht/~kikoodx/painfull-success-cg),
+ * which is MIT licensed. The MIT license requires this copyright notice to be
+ * included in all copies and substantial portions of the software. */
 #pragma once
 #include <stdint.h>
 #include "conf.h"
diff --git a/include/player.h b/include/player.h
index 87b5396..00ac29c 100644
--- a/include/player.h
+++ b/include/player.h
@@ -1,3 +1,9 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright (c) 2021 KikooDX
+ * This file is part of
+ * [Painfull Success CG](https://git.sr.ht/~kikoodx/painfull-success-cg),
+ * which is MIT licensed. The MIT license requires this copyright notice to be
+ * included in all copies and substantial portions of the software. */
 #pragma once
 #include <stdint.h>
 #include "vec2.h"
diff --git a/include/tiles.h b/include/tiles.h
index d97b396..d9e6665 100644
--- a/include/tiles.h
+++ b/include/tiles.h
@@ -1,3 +1,9 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright (c) 2021 KikooDX
+ * This file is part of
+ * [Painfull Success CG](https://git.sr.ht/~kikoodx/painfull-success-cg),
+ * which is MIT licensed. The MIT license requires this copyright notice to be
+ * included in all copies and substantial portions of the software. */
 #pragma once
 
 typedef uint8_t tile_t;
diff --git a/include/vec2.h b/include/vec2.h
index c7cac25..a0a1861 100644
--- a/include/vec2.h
+++ b/include/vec2.h
@@ -1,3 +1,9 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright (c) 2021 KikooDX
+ * This file is part of
+ * [Painfull Success CG](https://git.sr.ht/~kikoodx/painfull-success-cg),
+ * which is MIT licensed. The MIT license requires this copyright notice to be
+ * included in all copies and substantial portions of the software. */
 #pragma once
 #include <stdbool.h>
 
diff --git a/src/input.c b/src/input.c
index d5c12eb..2f07907 100644
--- a/src/input.c
+++ b/src/input.c
@@ -1,11 +1,18 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright (c) 2021 KikooDX
+ * This file is part of
+ * [Painfull Success CG](https://git.sr.ht/~kikoodx/painfull-success-cg),
+ * which is MIT licensed. The MIT license requires this copyright notice to be
+ * included in all copies and substantial portions of the software. */
 #include <gint/keyboard.h>
+#include <stdint.h>
 #include "input.h"
 
 void input_update(Input *input) {
 	/* Read full input stream. */
 	clearevents();
 	/* For each key, update state. */
-	for (int i = 0; i < KEYS_COUNT; ++i) {
+	for (uint8_t i = 0; i < KEYS_COUNT; ++i) {
 		uint8_t *state = &input->states[i];
 		const uint8_t key = input->keys[i];
 		/* See if the key is pressed. */
@@ -34,7 +41,7 @@ void input_init(Input *input) {
 	input->keys[K_JUMP] = KEY_SHIFT;
 	input->keys[K_RESTART] = KEY_6;
 	input->keys[K_EXIT] = KEY_EXIT;
-	for (int i = 0; i < KEYS_COUNT; ++i)
+	for (uint8_t i = 0; i < KEYS_COUNT; ++i)
 		input->states[i] = S_UP;
 }
 
diff --git a/src/level.c b/src/level.c
index 686f0f5..d00209c 100644
--- a/src/level.c
+++ b/src/level.c
@@ -1,4 +1,11 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright (c) 2021 KikooDX
+ * This file is part of
+ * [Painfull Success CG](https://git.sr.ht/~kikoodx/painfull-success-cg),
+ * which is MIT licensed. The MIT license requires this copyright notice to be
+ * included in all copies and substantial portions of the software. */
 #include <gint/display.h>
+#include <stdint.h>
 #include "level.h"
 #include "tiles.h"
 
@@ -7,9 +14,9 @@ void level_draw(Level level) {
 	uint16_t x = DRAW_OFFSET_X;
 	uint16_t y = DRAW_OFFSET_Y;
 	/* Cursor position. */
-	uint16_t cx = 0;
+	uint8_t cx = 0;
 	while (cx < LEVEL_WIDTH) {
-		uint16_t cy = 0;
+		uint8_t cy = 0;
 		while (cy < LEVEL_HEIGHT) {
 			const tile_t tile = level.content[cy * LEVEL_WIDTH + cx];
 			const int color = tile_color(tile);
diff --git a/src/main.c b/src/main.c
index 6211d06..f050681 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,3 +1,9 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright (c) 2021 KikooDX
+ * This file is part of
+ * [Painfull Success CG](https://git.sr.ht/~kikoodx/painfull-success-cg),
+ * which is MIT licensed. The MIT license requires this copyright notice to be
+ * included in all copies and substantial portions of the software. */
 #include <gint/display.h>
 #include <gint/timer.h>
 #include <gint/clock.h>
diff --git a/src/player.c b/src/player.c
index 7a71554..ddf4d5c 100644
--- a/src/player.c
+++ b/src/player.c
@@ -1,3 +1,11 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright (c) 2021 KikooDX
+ * This file is part of
+ * [Painfull Success CG](https://git.sr.ht/~kikoodx/painfull-success-cg),
+ * which is MIT licensed. The MIT license requires this copyright notice to be
+ * included in all copies and substantial portions of the software. */
+#include <gint/display.h>
+#include <stdbool.h>
 #include "player.h"
 #include "vec2.h"
 
diff --git a/src/tiles.c b/src/tiles.c
index aaf6aec..fbd65c4 100644
--- a/src/tiles.c
+++ b/src/tiles.c
@@ -1,3 +1,9 @@
+/* SPDX-License-Identifier: MIT
+ * Copyright (c) 2021 KikooDX
+ * This file is part of
+ * [Painfull Success CG](https://git.sr.ht/~kikoodx/painfull-success-cg),
+ * which is MIT licensed. The MIT license requires this copyright notice to be
+ * included in all copies and substantial portions of the software. */
 #include <gint/display.h>
 #include "tiles.h"