It's not bad.
It's a good little time waster. It's a bit hard to fill up the knockback bar to me, so that kinda bothered me a bit. Also, if you jump too much, it seems like the boulder closes in on you faster. But you need to jump. Odd. ;-;
The music is awesome of course.
Also, lulz @ Uzifus. Don't leave stupid comments. If you don't like it, say what you want improved and how. Not this is bad and blah blah blah. :| We have enough idiots on newgrounds as it is.