For first edit it isnt horrible. Its fine imo.
But as a vid itself, work on sync and speed(try using velocity thingy),
please use multipe shaders instead of one,
music was ok, but still unoriginal as almost every toribash edit nowdays,
put some effects like masking, flashes, filmburns and all this good stuff, that will make your vid looks nice, if you use it the right way,
Use freecam, or keyframes however its called now. But still, its good start if you ask me.
About the syncing, i never used M (markers) lol.
i actually hate the whole concept of this
we've already been over the mirroring so it just doesnt make sense to slap it onto a replay with cc and call it done
with sv
you want to press m whenever you want there to be sync, which you can do by ear or by looking at the sound wave
just sync up the second the dm'd joint turns red with where your marker is
( ͡° ͜ʖ ͡°)