Let's see. So far, my (and my wife's) ideas for zones are:
Circus
Temple
Swamp
Underwater
I think there was one more, but I can't remember it right now. I need to figure out that last zone, and then the big problem is graphics. My pixel art is getting a bit better, but I'm going to need quite a bit of it for this game. I wouldn't mind including hats (or something) but that'd need even more art.
I'm basically just an opinionated gamer, but I actually do research and make games. Currently, I haven't actually finished anything much though. Check out Grapnel (or on Kongregate). It's one of my few complete projects (although I do have plans for a second one).