I'm really feeling that percussion and bass, they fit together so well. This was pretty good, and I like the vibes.
I would say one thing is that I'm not getting super strong boss battle vibes, though I wouldn't bat an eye if this was in a less intense boss battle.
One thing I really appreciate about this song is the subtle reverb you have going on with some instruments. I think this can be really great for horror pieces, and you use it really well to that end.