If this game is more about genetics, you really should discard "evolution" from the title. This game is not teaching evolution, not remotely. You are misleading your backers and any potential parents or teachers who use this game if you refer to it as an "educational game about evolution."
I understand the difficulty -- I've actually written a number of genetics and evolutionary models for an educational company myself. It's really hard to create a game which doesn't get stuck in the teleological trap -- accidentally teaching kids that evolution happens because organisms "want" to evolve, or that evolution is directed in some way. But it isn't, and any game that implies otherwise is a bad way to teach evolution.
In our software (which is more about models, so we're not as stuck on the "game" aspect, though we still want it to be engaging), we had this same dilemma -- a "real" evolution game would mean setting the initial conditions and then sitting and watching for 100 million years -- so we typically took the tact of allowing the student to change the environment (abiotic factors or predators/prey). The population of organisms then changes in response to this.
I think the game itself may be fine, but if I were you I would focus on the genetics side, and scrap all notion that what you are doing is in any way related to teaching evolution. Because that really is wrong.