Too me a second to grasp: aha, it's in a 6/8 time! Love it :D. The repetitiveness made sure I easily fell into this time. The shakers have an interesting rhythm, emphasizing not beats 1 and 4 but 1, 3 and 5! It makes the song sound faster and gives it an unexpected 3-quarter pulse rather than a 4-quarter pulse.
I love how the panning of the bass goes from left to right. I still have to experiment with that someday! And it's awesome how the bass just keeps going throughout the entire song yet has enough variation in chords and notes played that it stays fresh. It just sounds really cool too!
The song didn't immediately scream "fungal" to me, but after a few listens and imagining it in a forest, it does sound quite fitting to me. The shakers, the instrument introduced at 0:13, and the one at 0:25, all do fit a forest vibe. And the fast-paced setting fits a boss fight as well.
The chords and melody are very nice, you always surprise me with that. Very cool song! :D
PS: this is currently the song I have on repeat the most. I really just enjoy listening to it for a long time! If there was an "enjoyability" rating category, you'd get 5 stars ;D