[main.c+JTMM.g3a] Drill reverse momentum when colliding with spike or solid.

src/main.c

@@ -103,6 +103,11 @@ int main(void)
 				}
 				draw_player(drill_x, drill_y);
 				collide_and_erase(drill_x, drill_y, level, 'd');
+				if ((selected_direction == UP || selected_direction == DOWN) &&
+					(collide_spike(drill_x, drill_y, level) || collide_solid(drill_x, drill_y, level, polarity, 0)))
+				{
+					vspd = -vspd;
+				}
 			}
 			draw_timer(step/2);
 			dupdate();