That was pretty cool

The song hurt my ears though (It's so sharp)

Also during the first replay it would have been cool if you keyframed it to look at the hits more

could've had better sync, and at least lasted 15 seconds.

^ did you even watch the video

did you see in your video that you dismembered uke's legs before the beat drops?
i think that is what he meant by sync
and yes, make it longer, there are people with the same skill as you do even better because of a longer video.

Also, you don't need to sync everything according to the music, it's like the music is controlling the video as what is shown to us.