I liked it. The graphics combination was interesting, and the level was, though a tad on the generic side, enjoyable. There were a few errors though:
1) When you go from the first to the second section, you go in a pipe and come out of nothing. It doesn't make much sense to not have a pipe animation in the second room.
2) I'll need photos to help me out with this one:
These two coins aren't visible when you actually need them. You can catch them in the corner of your eye going up, but you may want to move them up a tile or two.
This brown platform can kill you if you stay on it too long, as you'll clip right into the stone blocks (not pictured). Coins should be sufficient for guiding the player down here.
But yeah, other than that I enjoyed it. Hope you get around to fixing these!