I like the use of the distortion guitar, it definitely adds to the theme (perhaps Yuwall distorts the world around it just by being present!). And you make me realize I should really use cow-bells more xD. I do have to say that it feels more like a metal song than an enemy encounter. I'm not sure why actually.
At first I felt the song would be inappropriate given the slowness of the initial bass, but I'm glad you quickly followed it up with some quick drums! It does feel a bit to me as if it could use another instrument... perhaps another instrument to be played in the background, like the bass guitar. Anyway, I like what you got going here, well done :D