This is one of those games that makes it hard for you to tell if you're good, or if it's good at making you think you're good. Either way, it's immensely satisfying in short sessions. You'd think a game with only two inputs would get boring quickly, but it just keeps adding familiar-yet-different things at you so you find yourself having to remember the significance of various different things and then you have to figure out how to work all that into the sequence so nailing a later stage (oh yeah, I've only played through the, er, "story" mode) without missing and without being hit is satisfaction on a par with Super Hexagon. The different objectives are fun - Nunchuck and light sword rounds are so, so great - and the way it scales the speed depending on how well you're doing is a nice touch.
I don't like that it can get confusing with regards to what your stick guy will do next; you can pick up throwable weapons and I sometimes don't realise that my next move will throw a ranged weapon instead of a short-range strike, so I quite often waste the ranged ability. Also, enemies can throw weapons at you that can get hidden behind masses of other enemies - in other words, it's a visually busy game and at higher speeds it can get very difficult to keep track of what's actually happening. Normal enemies are fine, very bright and visible against the background, but I think certain other elements could perhaps be indicated a little better, but then again maybe I'm just old and slow.
For the price of beer you can't really go wrong, though. Don't laugh but I wouldn't mind a Mac version, this would be a great lightweight laptop game.