Ah, I found a "bug" in the game. (it's not really a bug but...)
When you're in full screen, and you reset the game, the window goes to the top left of the screen and you can't switch it back to fullscreen. >_<
EDIT: BTW, what language was it made in?
EDIT2: Another bug... Sometimes the key "down" doesn't work to interact, but works in the menu <_<