This game is cool, and educational! I wish I understood it better, though. Like when I buy a guppy, their "food" value seems random (sometimes it is 3, sometimes it is 49, etc) and when I feed them it doesn't seem to change - I think I am just not understanding haha. All my fish kept constantly dying, I flooded the tank with filters and tried to make sure not to over or underfeed them but yeah it was a fishy graveyard real quick. Then the game hard-crashed in a weird way, I had to kill it from task manager; that happened when I placed some food down. I dunno why
All things considered, it's a nice cozy game. I like the sound design, also the visuals are good (especially the bubbles from the aerator were really nice to watch). I think this has a lot of potential to be a real educational and cozy game with some more polish. Great job for a first game jam submission!