I really like the music aside from the artifacts, that may be a mixing issue.
Well executed concept, with a very complete game loop. Great job!
I think the color theory could use some work, because the pillars don't stick out great, come to think of it, it feels kind of flat in general, and hard to understand at a glance.
Looks like you have a knack for simple, but charming animations with the swim and hurt animation.
You could gather more interest by thinking outside the box conceptually.
Thanks for the game!