Well it's intense for sure. Technically I would bring the drums up level wise.. Playing is very well executed.. With just bass, guitar, drums, it's imperative that each 'player' is a virtuoso. Which you are. Let us hear, how great the drummer really is.
I think it's the bass, sounds like you have the bass strings ringing out? Making for a mushiness.. Now this might be exactly what you intended, and 'death metal' lovers might totally love it too. You might go back to the guitar sound used at the beginning, too, your choice.
Your guitar work is brilliant, and it's got a fuzzed gutsy sound, but it is very clear what it is playing. The Bass or low guitar strings ringing out creating discord of course is your decision as a composer/performer. Loved the ending.. You might consider putting a complete stop in the piece once or twice more.