Well, my main problem with this is the mixing, mastering and sound design.
Actually, some sounds are good, some are... well, not that good. Forget it.
There's really no formula on "How to design good sounds" ya know?
So, um, mixing? Like you said "Trying to balance frequencies and volume in this one". That's right!
In my opinion, both the kick and snare could use some compression. Something makes me dislike the hi-hat, it doesn't really fit.
The growls that start at 1:09 aren't amazing in any way either. Not terrible, but not great either.
And the mastering? Well, heres a simple solution: Multiband compressing! Don't overuse it tho.
Well, I liked the melodies tho. The plucked sounds and sawleads and whatever, you know what I'm talking about, sound pretty good too!
Overall: It's pretty good i'd say. Maybe I didn't even need to say some of these things... Probably just saying things that you already know...