For a first attempt at charater animation this looks very promising. It is very stiff, but it looks like you have the idea of anticipation and follow through motion... though it's a little difficult to tell with that whizzing camera! hehe (I think that would be the first thing I changed in this anim)
One thing that looked particularly bad is the mid air roll (I think because the legs were straight out, not tucked in - so it didn't look very natural)
Keep going though - it's all about practice