I'd be really interested in a sandboxy mode that lets me play around with weird city compositions a bit more
Which, now that I think about it, may run parallel to a desire to design levels for it...
What's it made in?
Well, if you look in the game's folder, you can edit all the levels and the rules of the game. That's about as sandbox as it gets, except it's in a textfile ;). Then when you start the game it will load up those levels.
I'll also upload the new version today :)
Ooooh