Great work. I like having to wind up the people. But it was a little too easy to defend the tower? Definitely would like to see more (levels, attackers, objects to purchase). It did crash when I accidently dropped one of the archers onto the floor. I think I was at level 7 or 8 by the time I needed to rewind. The attackers moved back but you get to keep the money (I spent it just in case before rewinding).