* CSS
* More levels
* Ending after last level
* Scoreboard
* Navigation bar
* https://alliballibaba.github.io/Sokoban-Level-Generator/
* Prompt for username after ending
* Table with filled usernames
* Error when last level is successfully finished
* Size of the canvas: tiles not squared with some levels
* Timer does not stop on win
* Le tracteur devient John Cena