I don't know if this happens in other levels too but in stage 12 I got this message which won't go away no matter what I do: "Level failed... Don't give up, just click "try again" and you'll succeed"
It's a nice physics game. Nice new little twist that I haven't seen before. The graphics were ok. The music reminded me of the 90s. And the puzzles actually got little challenging later on. Good job.