- Animation (need images)
? Should disable Tux's movement temporarily (1 second?)
[H] Tux should fall while walking in tiles that have a space between.
- - Possible solution: reduce Tux's width
+ - Possible solution: reduce Tux's width when checking collision with tiles
[M] Save score on per-level basis to make high-score
[M] Save time on per-level basis to make low-time-score