First, the game was well thought out and I really enjoyed the riddles. I felt it fit in really well with the theme and art restrictions.
However, I have a few pet peeves. First, the auto-full screen with no option to window it or not. Of my two monitors, full screen tends to lock to which ever I don't want it to. That's a me problem though. The control scheme with the main menu was frustrating. I almost didn't play your game. I used the arrows to move up and down and then hit enter to get the about section. Nope returned me to the same screen. Play? same thing. I used the mouse then in game, I hit enter again and it put me back to the title screen. Enter should never be used as a back navigation. That was beyond frustrating. Subverting my expectations in the worst way.