This is badass. I like the riff on the first verse, and nice job with the meaty tone of the guitar. The mix is already decent, but it sounds dry. But if you wanted to make it sound fatter or more glued together you could use a compressor on the drums with a short attack, it'd make them punchier and have more tight dynamics if you wanted it to sound more impactful.

I'd also recommend putting a subtle reverb in certain instruments just to fill up space, for example a low volume reverb with short decay on the drums to simulate being in the room with the drums, and putting a reverb with low volume but long decay on the guitar could fill up the empty background, especially with a compressor on the whole thing keeping everything together. Just putting little details like that, although maybe not what you're looking for, could make the mix a bit better.