This is a fun game to play! The idea of summoning the fish and then eating them works really nicely, I think, and the graphical implementation of the light looks good -- the dithered edge of it here doesn't seem confusing because it's obvious what it is and there's nothing else to conflict with. I was quite confused about whether I was making progress, though, and I think a couple of small changes would help with that. The first is to have the bite action make a different sound when you successfully eat a fish; that would clearly show that something had happened. And the second is that the "score" top right would benefit enormously from using a larger font with clearer numbers. It wouldn't have to be a lot larger, but the 3x3 font in use is so abstract that I didn't realise that they were numbers for quite a while; if it were 3x5 it would not take up very much more of the screen and it would be immediately obvious what it was.
The game over screen is very cool art given the limitations of the medium!