Over-usage of flash transition in the beginning
Kills could be synced with music, try that next time (fast forwarding, slowing down but not too much) (noticed you used it nicely towards 1:35)
Make the game sound a bit louder, but not to the point it over-powers the music
could try a different color correction style since that looks very saturated in most parts
at 1:11 when you slow down a clip, right click the audio and click the Lock to Stretch box so the audio doesn't sound ugly
other than that, best editing i've seen all week. It was simple and sleek.
I would like to see some 'wow' clips. like amazing multi kills, not the uusal spray shots and all.
Try getting some scenery shots here and there.
8/10 good job!