I agree with Preece, the character makes you want to move fast, but enemy placement and obstacle placement makes you go slow, the rest is fairly solid, even though it refused to go fullscreen.
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I actually place some enemies in the player's way to aid with the movement; the special moves can be chained if you hit enemies with them so there are some enemies that are intended to work as links between attacks in the air. I know I should reserve things like this to late levels, but since the gameplay still isn't finalized and I need to make new levels for every demo, I like to put in a bit of everything. I'll try to make the levels easier to approach in the future, at least the early ones.
About the fullscreen issue, that's odd. I don't think anyone has reported that before, but I'll look into it if I can reproduce it on some system.