Not bad man. It did seem a little bit like you didn't really know what you were doing though at some points, like kinda flip and hope.
Are you into skateboarding? If not, then i suggest you watch some skate vids and try and replicate some of the tricks that you see.
Some good stuff, just work on landings and realism. Also, learn how to work your slo mo properly. sometimes it just didnt look right.
https://www.youtube.com/watch?v=reHxX4xjrDY <-- this video is of me and a friend and we're using the same sort of camera as you. Maybe try and make the slo mos in similar style to us, it just looks a bit better.