Great game!
This is one great idea on games! GJ!
My suggestion:
1. Add more blocks
2. Add more things to place such as roads, etc.
3. Add a save feature to let us save our progress
4. Add feature for us to make writings on the blocks.....or something like that.
Also, sometimes the cursor's lagged when I moved it around. I don't know whether it's a glitch or it's just my bad connection. But I thought i'd let you know.
Anyway, good work! : )