This game insults your intelligence and your time. What's worse, they are hoping that you're so stupid you will actually pay them money so they stop insulting your intelligence and time.

75% of the fish you breed will die. You'll be sitting there trying new combinations having fun and the developers literally decided to throw your work in the trash more often than not. What's worse, it's the cool fish they do it to. The ones you'd be excited to see.

The kicker is you can pay the developer to stop throwing away your fish. Isn't that so nice of them? Micro transactions are not the way to go. Also, know your target audience. People who want to play a fish game are going to be few and far between, and of those people exactly 0% are going to get turned on to your game by seeing dead fish floating in their tank constantly where cool fish should be.