Pretty solid cover! Normally not a fan of Nirvana covers because people tend to either attempt and fail to pull of the whole Kurt thing, or they drone on with the song without putting any emotion into it...not here. Was actually really entertaining.
Good cover mate, I really enjoyed your vocals on the hard part/chorus!
By the way, which VST's did you use for the drums?

I used Superior Drummer's stock NY Avatar kit to trigger the midi drums I laid out for the track. Hope they sounded good to you, thanks for listening!