Really great game! Great art and well-crafted levels and puzzles. I love the different mechanics and the twists the game takes on them, like the spikes being added to the moving bubble platforms, using the water geyser jars on the moving platforms, or having to swap between the different pick-ups. The game and puzzles felt very intuitive and I don't think it was ever unclear of what I needed to do outside of solving a puzzle. The checkpoints were pretty forgiving, which is good. One small complaint is that having the grab key (E) right next to the restart key (R) had me restarting from a checkpoint by accident a few times because I pressed R by mistake instead of E.
I saw that your team is considering expanding this for a Steam release. Even as I was playing, I was thinking this game could easily be made into a full game. Really solid entry here!