I like it. You could add more things in it and make it a much more in depth game, too. It's a very simple idea, which is by no means a bad thing, but it tricks you by having some pretty complex levels that take quite a bit of figuring. The last level, at first I couldn't get it at all, then suddenly had a moment of inspiration and finished the final level in 19/24 moves. Lots of fun.
You should work on a version 2 with lots more goodies. There's plenty of stuff that could work, like switches, conveyers, timers, power ups, etc.