The platforming got tedious and frustrating at times. Collecting a heart should have been the reward for completing a section, but some placements forced me to jump back down and redo the section entirely. It felt like a punishment, having to place bubbles and make the same jumps over and over just to get a heart. I even ended up stuck and had to restart from the beginning.
I’d much prefer getting more of the puzzle elements. Because honestly, I’m really impressed by how many creative puzzles you managed to come up with using just bubbles and fans.