Nice job, the movement is smooth and works well. I guess one thing I'd maybe change is the animation for vertical movement in the water. I don't think it should be that ball in motion kind of jump underwater, because you can stay in the animation all the time underwater, you kind of forget that you're playing as a someone with legs if you're just constantly in that other spinning ball thing.
So maybe a swimming animation?
I don't know, but yeah, looks cool and simple. Music's a little silly, country-ish but whatever, it's cool