Fairly interesting, but somewhat pointless and it gets rather boring after so long, especially considering that, as far as I know, it's endless.
I liked how it played, like how you can actually stop, among other things, and I didn't find any bugs, but it's not really very hard.
I would have liked it better if there was a score-board, or medals or something, but I really have no idea how hard either of those would be.
As far as games like this go, I think that this is one of the better ones, and it's one of the first ones to keep me interested for any amount of time.
I actually would have found it hilarious if it had fight-scene-type music, though. That would have been interesting.