It's pretty good for a first off level. Short and sweet. Thwumps are good to manipulate and use to push N around, its good technique especially if you use it with a few bouncers. And mines are a good way to add effect. Try getting a few more enemies next time, that way you can get loads more close calls and higher ratings. 3/5 for me.

Short but fast-paced, and kind of advanced for a rookie. :)
Nice, very nice for a first....
I will give you a 3.5/5.
btw, could you or anyone who looks at this please please rate my levels just submitted The Vault, and Dangerou Flow? My levels are increasingly ignored recently, and I would really appreciate it. Good level, keep it up!