So this is nice! I really like the mechanic, and I like the art, especially the jump in air particles.
Would be nice to have some more backstory, like what is the flying needle?
Also it would be cool if I could jump into a wall and then dive into it rather than duck into the floor and then swim up. Also the inverted controls when you are upside down are a bit confusing, but I get why that would be hard to change.