This is becuase it just isn't a very good tileset, and there are some other elements. at the top the use of two "bats" which don't really look like bats at all, in order o contain the world gate witch, it is difficult to get in, but not difficult in a good way. I t is just frustrating for the level not to flow well. Also, the jumps off of the bats are rather awkward, but they make for some good rocket-dodging, which is the sole redeeming feature of the level. finally, it is a little too easy, but it is far above some of the other crap being submitted recently...
keep trying..
harder, preferably.