First, I'd like to thank everyone for participating. I enjoyed all of them, and I'm trying to avoid commenting on the mixing and
Apteronotus - You nailed the dirty black metal guitar playing with the phrasing of the slides. I like how you brought in the melody at the end too, that's a great transition to the ending. Didn't enjoy the solo too much, it was a bit inaudible, but I get what you were going for with it.
Awblaster - I like the dynamics of the intro and outro, but there's a lack of dynamics between there. I like how you led the song with the vocal rhythms, and the guitar playing is well paired to the vocals. There's one riff that's repeated with the vocals a few times that feels tiring, I'm not quite sure how to describe it. I like what you did overall and it has a well-produced black metal feel, though something about the vocals and guitars is a bit rough on my ears (might be my headphones).
CorpseFister - Holy shit the vocals. The vocals are amazing. I like the distant feel of them. The synths are a bit overwhelming at times, but the sound is really cool, like a combination of early 2000s keyboard metal mixed with the distant screams and production of black metal.
Grimmig - Punkish blackish metal, this is cool. The vocals remind me of Burzum. The first riff reminds me of "Ea, Lord Of The Depths", while overall the instrumentation reminds me of Darkthrone. I think you could make it even stronger by working on guitar/vocal interaction and not timing them together 100% of the time.
kingnuuuur - You certainly have the Ulver sound down! I can't tell without referencing Nattens Madrigal if you stole their song or wrote your own. It gets a bit repetitive, but the harmonized melody at the end is great.
Marras - Very sharp, abrasive sound. The vocals are really percussive. With some mixing and smoothing out, this could be a really strong song.
mcmuffins - I like the second guitar part a lot, it's a good transition from the first one. The vocals are pretty harsh and they're really loud, didn't like them too much
SLK - Good blackish grind. I'd like to hear it when you redo it. You already covered the things I'd comment on, mainly the lack of mixing and the vocals being a bit strained, so there's not a lot I can add.