As I said before, you should try sticking to one single tileset, and the slope use seems really awkward. The cactuses, airship tiles, gray pipes and SMB3 hills/palm trees might also be unnecessary, but I'd have to see more to decide on that. Anyway, waiting for a playable to give better feedback on this.
At this point I'd suggest just restarting the level. There are so many different tilesets, sprites, pretty much everything crammed together and none of it works. You should really try to focus a a few gimmicks only, restrict the sprite/tileset a LOT more and try again. This is not going to work.