On the Playfirst forum, I read about Townopolis. I thinks it's a lot of fun! Very similar to Build-A-Lot. The demo only lets you play the first 8 levels, but they're pretty difficult and I could play them multiple times to go for the gold!

Here's the link:
Townopolis

I hope BFG gets this game!

Thanks Stella!

You'll have to let us know how far you get