Very original idea!
For me the main hurdle was remembering all the species attributes - I would make it visible when viewing the planets (actually on my first playthrough I just selected a planet randomally and got a game over without understanding why lol). I get it would make the game too easy right now, but since you can go back and forth between the planets at your heart contents, you really only make the game longer, not harder. Challenge can come by adding time limit, making descriptions more vauge, or toher means
Good job!