Nice work guys! Music is great, and I really enjoy the shadows of the old man projected back on to the buildings in level 2 -- not sure why. :)
It's a good game idea, but the difficulty curve wasn't working for me. I was able to pass level 1 by doing seemingly nothing, then I just wasn't organised enough to pass level 2. As others have said, a tutorial and a bit of refining of the difficulty will help a lot.
Looks like you made the 3d assets yourself too? Good effort in only a week of work.