F*** yeah sound design OST. Big fan of this style. All I'll say is be careful when working with so much distortion, it can be hard to know whats too loud. I see you got Ozone 9 for the mastering so thats sweeet, I would just add some more compression to each individual channel and maybe even put the SFX tracks into a "Summing Track Stack" and glue compress all of them together. (mind you, this usually removes a lot of dynamics from the overall mix but makes distortion less harsh on the ears.)
ps. My friend, you need that SoundToys bundle. You will fall in love.