Being the HAN resident musicholic I'll give my $0.02 for what its worth...
Intro - good but a tad bit too long for my liking
Vocals - a little more clarity would help and your singer is clipping a few times. I am a big fan of death metal vocals, but the synchronous clean and metal ones don't really go well. Try and do a After Forever or Nightwish style deal... either start of clean with a death metal interlude. Or start of heavy and do alternates.
Guitar - good but where is the SOLO... SOLO is key for the type of music you are trying to put out. If you can't solo too well add a piano interlude like in Dimmu Borgir's In death's embrace. Its a very heavy song but the piano part makes it even heavier.
Bass - good and heavy
Drums - like them... add some double bass for effect on the heavier sections
Lyrics - need a little more content
Its very good for a demo... the ending needs to be better. Almost seems like you guys decided ok time to stop.
My $0.02... if you want more advice PM me.