There's a lot more strategy to this than I expected, I'm impressed. Multiplayer would be awesome, but adjustable difficulty levels with smarter and dumber AI would be even more awesome. The AI sure makes a lot of stupid moves, at least in the earlier levels.
Good game, needs polish. Scoring system needs tuning, some levels are impossible to complete as quickly as others. A few levels rely far too much on luck, the puzzles aren't bad but need more player input. And R to reset!
I would like a second set of markers available, distinguishing "pencil marks" and "pen marks" to make trial and error easier to backtrack from. As is, I have to take a screenshot to keep a reference of which marks I'm sure of. Otherwise, great game, although I second the request for immediate mute.
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To all people for whom saving doesn't work: please PM me