Brace yourselves, lad this is going to be a long one. I am going to write this as I play.
At the very first few seconds of the game, I was taken back to a OG Mario like feel. I don't know why but it felt very very nice. (what psychological tricks are you guys using? 🤨)
The next thing was the controls & mechanics. I found them super polished & really nice to be in the shoes of the character. I kept inflating/deflating just because it ticked a satisfying ick in my brain! 😂
Clever design of the sea urchins sticking with the sponges. - Just when i thought that was clever. I was introduced with the blow rock to hit enemy mechanic. Wowza that is super cool as well, Makes me (my character) feel super powerful & smart. The 'hitboxes' of the spikes are forgiving which makes the experience pleasant & not frustrating. The deeper you are in water & further you jump out of it a great attention to detail (also that you have to use this mechanic to get through the levels) Also noticed that sea urchins open & close eyes are you move closer/further away. Platform physics are top notch. Moving Mouse Moves the map accordingly as well. Each level has some new gameplay element which I found immensely interesting & fresh. (Who the hell did you have in your team that pays such close attention to detail??? )
I really really like how there is no pressure to 'breathe' you can just deflate & blow to precision as you wish which for someone like me struggled in a-lot of the games that I've been playing.
Another issue that I've been facing is user-onboarding & teaching the controls when someone first jumps in your game. You have done that very well considering I was able to fully grasp the controls & get used to it.
In the end, I unfortunately couldn't finish the game because of my short attention span (that really shouldn't say anything about your game). It was an extremely fun experience.