Well, I swam for about 5 minutes and didn't see a single red pellet. Super chill atmosphere, and a little hard at first to know that you're actually advancing anywhere with the static blue background. It wasn't clear that I had to go in any direction to find food, or anything for that matter. Eventually I hit the floor, then the right wall, and then the left wall. No food!
I love ocean sounds so the chill atmosphere was nice, but some music or anything would be great! Some background bubbles near the top would help orient players that they're not just in a blue square unable to move.