Fun, well designed
A very fun puzzle game. Here's what I would change:
-Add some background music. Or at least take out that weird fly buzzing sound effect. It sounds like it belongs in a survival horror game, not a puzzle game.
-Why are there fireworks when I lose? I'd take them out.
-Make it easier to view user submitted maps. Maybe you could cycle a "top ten maps" kind of thing.
-Make the green blocks solid. I mean, you can never pass through them, and they aren't exactly hidden. So why should they flash like that?
That's it. Hope you make a sequel!