I'm glad I managed to fix my keyboard input lag to play this, because it was pretty fun. I like the way the arm retracts after retrieving the item (although it got stuck in the middle of some walls once, which was quite funny).
One improvement I'd like to see, especially on the last level, is to not have the grabber start straight away — being able to press space or something to start moving would have been great!
Good job on this :)