The game has a certainly unique idea, playing as a treasure chest.
Animations for the chest are entertaining. Graphics are smooth but please turn the motion blur off or ad an option to. Level design is alright.
I see you put a lot of work on the visuals.
Now for the bad stuff:
Firstly the main menu button selection is to slow, it should be instant, 0.5s delay is too much.
Keith doesn't lose track of you when you're even when you're out of his sight for a long time, only when you stun him.
Buttons should have a pattern connecting them to doors they open so the player's can't be confused where to look for a button or which door it opens.