I really liked the very cute animations and how fast you are outside the water. They have belly buttons!!!! I don't know why they needed that. But I love it!
Also the idea behind the waiter-air-balance mechanic is nice. But I think, it should charge faster. so you really need to try and keep it in balance.
I really missed sound (background & sfx), though. I don't know whether this is a bug or you simply didn't have sound.
And I did not like that you would continuously jump, if you held down space.
The bubbles, could be an animation than an upscaling. The upscaling makes it feel a little out of place.
Did I mention how much I love these adorable animations?
I am really curious into what this game will turn in the end once it is fully finished.