Guidance by oyster_crusher 2014-04-28T21:47:00
Right off the bat, the controls are a bit awkward. A lot of people are more comfortable with WASD, and from the outside, it looks like you have little to lose in mapping the movement controls to WASD as well as the arrow keys. While U is a memorable undo button, it suffers from being too far from any of the other keys you use. Might I suggest taking a look at Puzzlescript games' controls?
The mechanics imposed a set number of moves to solve a puzzle, which imposes a sense of every action mattering, a sense I had already begin to suspect the moment I saw it had an undo button (love the undo button, by the way). Whenever every move counts, it makes you really think several moves ahead, which honestly makes you feel rather clever whenever you solve a puzzle. Optimizing your solutions to squeeze out that final step too many is a nice feeling, one I quite appreciate.
Sadly, the graphics are lackluster, and there doesn't appear to be any audio (correct me if this is an issue on my end), and the font you've used for text clashes with the pixellated art style of the game. Making a game comprehensible with such a small colour palette is a noteworthy achievement, kudos for that.
I always prefer when the theme is implemented mechanically rather than through story, it makes the game feel far more tailored to the theme, rather than shoehorned in at the last moment.