Things I liked:
1. Song Choice: Had some good buildups as well as sync opportunities, plus it was enjoyable to listen to.
2. Replays: they were good replays (made by great rpl makers of course).
3. Nice use of the atmosphere script, but you could've varied it a little bit.
4. I actually liked some of the fast transitions that you made, it helped regulate the speed of the video.
Things that can be worked on:
1. Camera work: If you can learn how to use the free cam, then I think you'd do a lot better. (Hint: click "2" when recording a replay and use "k" to initialize keyframes).
2. Sync: There were soooo many build up points in this video that you could've used to your advantage and you missed almost all of them. For example, at 1:06-1:07, you need to kill it with fire.
3. Tempo Variation: Vary the tempo of the replays themselves from slow motion to fast-forward.
4. Going back to transitions, I'm sure that your video editing program has the capability to show other kinds of transitions.
5. Shaders: You may vary them a bit, but it's your choice. Actually, for this video, the same shader may have worked well with the video, but that's the viewer's decision.
Keep it up, work hard for the next video.