Hey dude, your work is really good and this showreel does a good job in showing that off!
Personally, I suggest mixing it up later on and instead black flashes, switch up the intro clip showing with the quick beats, even if you're just showing a clip for like 4 frames. Flashing the screen black or white (like a dance club strobelight) is nice in moderation, but using it throughout your entire video can tire the eyes a little, and switching the clip with quick cuts can fit well with this kind of music.
Definitely keep up the good work!