@Zexogon omg! Thank you so much for your ideas
@JosephSanthosh It's in the description of the post!
Write a number between 0 and 35 and then press enter to start the game.
The controls are:
'a' or 'A' to go left
'd' or 'D' to go right
' ' (space) to reopen the menu
Also, the purple square teleports you to a random place.