Cool. After my first 2 goes I didn't think I was going to get anywhere, then I suddenly got just the right touch and it all worked out nicely :-)
Great idea and a good control system.
No music, but I can't complain because I didn't get time to put any into my game either ;-)
Some more levels with increasing complexity would be good, but you'll have to be careful not to make it too difficult to find the exit to the next stage. When I first started playing the game, I thought I might have to memorise the position of each exit. After I got control of what was going on, I realised that wasn't quite so important :-)
Nice game.