Simple, yet addicting gameplay. Nice inclusion of the leaderboard. It gave me plenty of reason to try to get a good score. I managed a score of 43 after a good handful of attempts.
I'd love to see a little better balance with the fish randomization (sometimes you get stuck just waiting or fish to show up on screen). It also feels bad when you randomize to the same fish you just had, especially for the big, slow fish that take a long time to show up on screen.
Perhaps some things to make the big fish feel more rewarding would be for those ones to count as 2 fish when you eat them?
Overall, a solid entry that I had a good bit of fun playing.
Edit: Oh! For some reason, running this game in chrome has horrible framerate issues. (like 2fps). But I opened it in Edge just to see if it would run, and it runs fine in that browser. Not sure what was happening there, but thought you might like to know that.