* Add a level end screen that shows automatically when dead or level
is finished
* Lock player controls and GUI before the end screen shows
* Loop back to the main menu after finishing a level (or dying)
* Nerf combo chain score
* Add a placeholder KO animation for the player, and associated logic
* Make all hitboxes rectangles
* Add sprite-based hitboxes for attacks, keep the original ones only for
map wall collisions
* Reorganize and rename animations
* Separate player movement and swing animation for the AoE