I would like to use the space bar (or some other button) where the mouse clicks anywhere on screen are needed (e.g. in the challenges.) That would make this game much better.
Only comment: I would like to see the dev high score on the screen after death. (i.e. show Score, High Score and Dev High Score.) That way, I know how far away the dev high score is without going back out to the main screen.
A fun game, but I would like to see a "jump to area" option for places that have already been found. It would make traveling a little less of a hassle and fix the stuck-in-the-wall problem that I have had on many areas.
Fun concept, would be better if it had an upgrade system (Shot power, max ammo, power up frequency, etc.)
Just some extra reason to play through the levels, like achievements or something, would be good too.
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