Sounds like you have way too much sibilance in the intro track, which didn't do much for me. In the second track, the vocals are quite distracting because they are accompanied by a distorted hissing that cuts in and out really hard when you start or stop. This also overpowers the rest of the music. The riffing sounds like there is some interesting stuff going on, and the rawness adds some charm, but it is under so much of that vocal hiss that I am reluctant to increase the volume very much. While some of the wavering volume and tempo is expected in rawer black metal some of the more extreme changes could use some flattening. Counter to that would be retaining these changed but accounting for them in the composition and using louder faster sections as a place to highlight higher energy riffs that are specific to that section.
If what you are going for in the future is oriented toward a more atmospheric sound then I would suggest a strong bass guitar section to create a wider, richer tone.
The 4th track sounds like it has a ton of clipping in the drums which make them go from raw to just poor sounding, and the problem with the vocals returns to spoil what you have going on with the riffs. The drums and vocals though could also use much more variation to highlight what you are doing melodically. Overall, some of the melodic ideas create a nice atmosphere but not much else is going on and I think this takes the rawness too far and it would be more successful at around Belketre levels but it seems like you are planning on that from the higher quality comment. The more stripped down sections also felt far too bare given how busy/noise the music is on average. It makes for rather drastic and jarring transitions in a manner that serves to detract from the atmosphere you built. On that note, the last song does not add much in my eyes in the same way that the first did not - boring riff with some talking and distracting effects lopping on top of themselves.
Good luck with the demo and on recording with the local label.
The very cool Blog/Distro/Label I review for: http://www.contaminatedtones.blogspot.com