- Hitbox outlines instead of filled rectangles
- Tweak Mario's velocity/acceleration when hitting a block from the bottom
- When falling and not pressing A, should Mario be jumping or not?
- Goomba-goomba collision is not considered. In particular, if a Goomba falls on another Goomba, one Goomba falls through the ground
- Mario can walk through pipes with I-Frames
- After bumping into an enemy with Big Mario and shrinking to Small Mario, staying inside the enemy will result in Mario stomping and terminating it instead of Mario being terminated
- When walking left into a Goomba as Big Mario, small Mario maintains his momentum, even when right is not being pressed
- Big Mario doesn't do the proper shrinking animation when colliding with a Goomba from the right.
-DDRAW_HITBOX: Set to 1 to enable debug hitboxes, 0 to turn off -DMANUAL_INPUT: Set to 1 to get hardcoded input from a vector instead of from the keyboard