- Count moves
  - Show moves on the screen
- Change sprites for top and bottom borders
- ESC to quit (what's the point)
- Map chars:
  - 0 empty
  - 1 wall
  - C collectible
  - E exit
  - P snas start position
- Map conditions
  - 1 exit
  - 1+ collectibles
  - 1 start position
  - rectangular
  - walls all around
  - a possible way to exit
- Program takes the map file