figure out your codecs so you dont have the interlaced issue, same with the weird shadowing
clip your videos better, so they dont have the awkward pause and stop at the beginning and end
use this -
Replay Target Removertry to sync the visuals to the music better
don't end it abruptly like that
be consistent with the clips you use, be careful when mixing replay, slam cam, stationary replay, and reelmaker
other than that, you had a good song, interesting plays, nice effects, and lots of potential. Just needs a lot more polish, that is all.