"is there some kind of story? or is it just running around killing everything you see?"
that's what I thought as well... not really "gameplay" yet.
but seeing how little time you seem to have spend on this (the two days and then just a little in the past months?) it looks great.

I don't like how the character slides. at some point it is because he moves without moving his legs (= moves without walking) and on other parts he moves his legs but can't get forward because something's blocking his way.
I solved the second problem by just trancing into the direction the player moves, about 1*the player width. if there's something there, just ignore the input (just act as if that key wasn't pressed)...
worked great for me, and I think it looks much better

one more thing: I believe the user will get tired of that ponytail the guy has. not because of the tail, but because of the animation... after seeing that for 10 minutes, your head will start going from one side to the other

I think it's great work so far.

Micha