I do find the palette dull if it is used like that. The level itself seems fine but it is best not to use the decoration like that (all over). Also it would be better if you linked such a large screenshot.
Looks pretty nice, but the white color stands out too much. I recommend changing it to a lighter shade of the same color instead, as I guess it would look better. It also seems that there are way too many decoration skulls in the ground, but that might be just me.
Other than that it looks fine, I guess. That grinder looks a bit hard to pass through when big, but that might be jus tthe screen.