That's a pretty neat puzzle game! It really enjoyed playing it. Love how the mechanics are introduced and explored. I'd love to see a bit more narrative framing here, but 15 decent puzzle levels in such a short time is already and achievement. There were some collision glitches but overall it was a smooth experience. That said I would add a pull button, because only push complicated some solution and forced me to restart the level without any pay off. Seemed like more of nuisance rather than a proper mechanic. I think the concept could be developed further.