Update #1!
Last night I did a lot of brainstorming. Today I woke up and am getting the platforming and basic level design. 
The first game that I thought of when I heard the theme “Evolution”, was the game Eversion. It starts out really happy and cheerful but slowly turns dark and kind of disturbing. I really like that, and it inspired me to make my game. So for my game, I want to take a similar approach with changing levels but with a different mood. Im not sure yet, but here’s a screenshot of how it’s coming along so far!
-edited to explain myself a bit better./
Comments
ahnimal
25. Aug 2012 · 20:00 UTC
But the theme is Evolution
markh
25. Aug 2012 · 20:07 UTC
Yeah, I meant the first game I thought of was Eversion. I like how the levels change more and more each time. But following the theme Evolution for my game.
ahnimal
25. Aug 2012 · 20:12 UTC
Oh right. Guess I’m too tired to read. Still sounds odd from your description though