Great game. The graphics (and some of the bonus levels) seem to be inspired by Baba is You.
Bug report: On level 24 you can travel down into your own body from the start.
This shows how important good level design is in puzzle games. The bridge building idea is nothing new at all, but the game is really fun purely because of the excellent level design.
I can't play because I don't have any energy. I have to wait 3 minutes to get energy. The energy is a bad idea in the first place, but it's just plain stupid to start people out with no energy.