Oh! I thought the controls were kinda intuitive (every white character that is in front of a black square is a key control) and on the main screen I added the only control that ain't mentioned anywhere else (e to use object) but after the jam ends I'll see what else I can do to improve it.
Also, this isn't actually a builder game, instead, it's a game about collecting 10k of money the fastest way possible (BUILDing up a small fortune) but I understand the similarities you could find.
Anyway, thanks for your comments and the feedback!