Interesting idea - kind of like mad libs for game development. As a game, I didn't find this very fun, but as a work tool, I thought it was really cool. I see that you allow the player to rotate to the underside of the environment. Perhaps that's an opportunity for a different type of idea forest?
Took me a minute to figure out the controls and the music didn't work for me (Chrome browser), but it had a really cool vibe and I liked how you set up the environment. Minimal, but quite effective.
Great work and cool entry!