What a great thinky game. easy enough to slide in but hard enough to be a little bit of a noodle bender. well done! I haven't played a puzzle game this original in years.
I only have one request. A RESET HOTKEY!!! ifhcgjiuygtfgcvghuoytfr!!! Sorry, it was just a bit annoying to try and hit the cool little button to reset every time my tiny brain screwed the puzzle up.
A one-move undo could also be nice but that's your choice.