Much to be improved
The art not being one of them. Seriously, I admire your artwork. I can't wait to see what you can do when you animate.
I see a lot of little things that could be improved. The tentacles that come out, the direction in which the girl is facing, sound effects, score, etc. These are things that aren't really important by themselves, but if all left out, will hurt the game quite a lot.
I see a lot of potential though, maybe as you get to the end, the creature who's trying to grab you with it's tentacles comes out as sort of a boss. Then maybe also get some powerups along the way so that you can gain a more destructive weapon.
I disagree about it being too cluttered or confusing, I like the pace and the atmosphere, and the building's going by in front of you make for a good effect.
All in all, it's a game that just needs some more work done. Keep on progressing!
-Flecko-