personally I hate fisheye, but if you're going to use it, get dirty and REAL close. The editing was nothing fancy; this isn't a bad thing because I didn't notice the editing, which should be the goal. That being said, the bmx riding is good, but not amazing. To make it more interesting, I would use more interesting/creative shots. Put the camera in different places, places you've never seen a camera put and just try it out. If you're just doing a 1 camera shoot, you can use a match edit and cut together a different take off and landing and make it look smooth. Exposure and focus are another area you can improve on. Not sure what you're shooting with, or your level of experience.
Whenever you make something and put it out there for someone to see, you're already taking a step beyond what most people do. Once it's out there and you start to get feedback from it, take it all with a grain of salt. Sometimes you'll get a legit critique of something you did "wrong" but if its exactly what you intended, then you have nothing to defend. Take the criticism you receive and put it in the back of your mind, so the next time you're out shooting you at least have something new to try.