Very interesting idea for a game. I didn't quite get to the end, but I might come back to this at some point.
I thought the puzzles were really cool and well thought out. My only gripe with it is that it was too easy to accidentally die while focusing on moving the blocks around. I think if you had a camera-scroll feature so the player could park John Gravity Jean Graveaux somewhere safe, then scroll over to the puzzle it might alleviate the issue.