Pretty much agree with everyone about the blue dude dying part. It's just really "

As for what you said about the colouring of SAO. I understand it was coloured like that in the anime but you can always adjust it to fit with your track. It doesn't have to be super fancy colouring effects, most editor programs come with a simple colour balance/curves tool you can just play with and come out with some amazing effects. Or you can even just bump up the brightness/contrast levels and that'll sharpen the colours considerably. It's just so the colouring between SAO and AKB looks more even in your track that's all. What video editor are you using? If you're not sure how to do this or get what I mean exactly, I can show you a screenshot or if it's vegas, I can even send you the preset I use and you can just adjust it to fit.
@code:
I think the slow parts of your track are pretty much spot on perfect in terms of mood and scene selection. 0:18-0:21 seems to be lacking a few beats in the background for the sync though. Or alternatively, some black or white flickering will easily sort that problem. The actiony part also seems to lack a little impact though since the beats are heavy but you went for lyric sync instead, so I think you should stick with the beat sync, if the flashes are annoying in the footage, you can always use that to your advantage and create your own red flashes for the beats.
@inan (sheryl + denpa):
I agree with Code, the Sheryl part is really awesome and it'll fit great if you made the full track about her. Also I'd fix the lipflap Code mentioned and at 0:29/30 some overlay/beat-hitting/flickering or something to the beats would be good.
@inan (skip beat):
I feel like the section from 0:39 after the Fuwa Sho promo section and until the end seems kinda...I dunno, weak? The only thing I can think of at the moment (because I can't remember what scenes the anime still has left) is to use the one at 0:46 with Corn as the ending scene instead, and add more depressing Kyoko stuff (her childhood, the Sho thing at the start of the anime etc.) in place of some of the scenes from 0:39-0:48.