Really good game. The gameplay is fun and ramps up well with new mechanics. I like the addition of time and move records for each level. The graphics look quite nice and there's a surprising amount of detail. It's overall very polished.
The one thing I dislike is how some levels are larger than the screen. You can't tell whether going off the screen will kill you or lead to another part of the level and it's hard to figure out where to go when you can't see everything. Maybe there could be a way to pan the camera around the level?