This is a cool game. And the visuals are great, for what they are. The level looks nice and is fun to explore. Yes, it's a bit difficult to discern between ripples and fish, but the ripples look super nice and as far as I can tell there is no penalty for trying to catch a ripple, which helps to make it not frustrating.
The "bossbattle" is a nice surprise, even if it's simple. And also, reading your reply to Colin's comment, those are cool ideas for a surprise at the end, your "score" being the threat level. Very creative.