Talking about the beginning of the video, where you used replaymod: Not wanna hurt you, but this is really.. really bad. First of all I can see the scoreboard, make sure you turn that off. Also I can see (in the first seconds) the chat message that you've started the replaymod record. Cut the first seconds out if it, and it should be better. The keyframes aren't placed very good as well, you can cut parts out off the video so you don't really see this/it doesn't matter. not sure if it's possible with the original replaymod, but turn players off it looks horrible. But most importantly: use shaders while rendering, it makes it look sooo much better! Also the camera perspective goes through an ''island'' make sure you don't do this again.
I think the video would be better if you didn’t use that texture pack.
Exactly that
Anyways, the rest of the video is really nice! Nice blockclutches, and the best music ever :D