I'll try to figure out making a timer that ends or restarts the level after a certain amount of time waiting for pieces to move after the last move is made. Right now using more moves is the only way to actually reset the level!
The solution to Level 4 is all about bouncing the Pawn off of the friendly Queen to hit the lined up pieces in the back. The game never really shows you that doing that is possible. I'll include a level that remedies that in a later build.