I didn't know what to expect, but GOD it got dark really quick. I don't know how you came up with this, but it was genius. The art, the mechanics, the gameplay, the story... it didn't even feel like a game jam game!
This looks like Up (also just as hard) in a concept level. The art is on spot, everything seems mixed right. The movement could've been smoother, but that's something you could easily fix. Quiet good!
This looks awesome! You guys managed to do everything from art and mechanics to voice acting, this seems more like a vertical slice rather than a game for a game jam. It feels so complete and everything was put together in harmony. Keep it up!
The idea is quiet nice, and the art just hits the spot with what you're trying to express. The only down side would be explaining what is the goal and how to achieve it. Keep it up!