Oh, these are my favorite games, I love some colony/ecology simulator!
I think the mutation system is good, though I think it would be better if there were some visual changes, so I know which of my fish have mutated or not.
The breeding system is also very interesting. I used it to breed fish with "good" mutations.
At the end, I killed the turtle with uranium, but I didn't get a success screen, but I think I beat the game 😊
Ah, there is a freeze happening every 15-20 secconds, maybe there is some hard processing going on?
That said, I'm being nitpicky, it's one of the games I enjoyed the most on this jam! Congrats on the great work and the big amount of mechanics you were able to implement in so little time