Very good, I liked it! Very passionate!
There's constant intensity and strife in your music, and I like that, but that makes very hard to conclude songs. What you did in "Hearken the Breath of Solstice Calling" is a good way to conclude, but I'm not that sure with the other two songs, specially with "Wanderer"; even perhaps having in mind that you wanted to save a more conclusive ending just for the last song of the demo.
Bands like Wolves in the Throne Room suffer loose ends in their songs as example, but then I recall some epic conclusions like the one from Inno a Satana by Emperor, or Inn I Slottet Fra Drømmen by Burzum.
A good narrative demands not only a good sequence between riffs, but a good outcome of the song as an unity too.
Also, the snare in "Wanderer" gets too loud when you are not playing blast beats, and that undermines the guitars. Perhaps you noticed this because in the other songs the snare is much more balanced.
That's all in my opinion, I really liked it, one of the best projects from a member of this forum. I think that there's not too much to criticize here!
Edit: Although somewhat typical for a black metal band, the cover is well designed and has a distinctive and nice tonality. I like the logo and its placement in the photo.