Very interesting concept! I felt like the game could have benefitted from some smaller puzzles at the beginning, otherwise the players can feel lost quite quickly. I'd also recomment putting some individual tutorial for each of the body parts -- legs can jump, arms can pull levers, head fits through small spaces. I also wonder how different the game would feel if the camera was static, and allowed players to oversee the entire room at once (rather than move between body parts)
But I hope you'll continue to work on this game! It has great potential, and I'm very curious where you'll take this next!