So casual. I'm gonna sit at my desk, sip some coffee... Yell a little.
It's not too bad, my initial impression is that you do indeed need more practice to be consistent. You sound a little like I did when I first got back into growling. I went over three years doing no vocals and that first practice session was hard, couldn't keep my voice steady. I thought I lost the ability, but after a couple weeks it fell back into place. Sometimes it's still not as good as it used to be though.
There were a couple parts where your voice would randomly get more brutal, but mostly a couple words at a time. The first chorus when you say the word "mute" it had a little bit of Fathomless Mastery style tone to it. That whole line sounded pretty decent actually, then the second half of the chorus sounded more fatigued.
Honestly it's probably a practice/warmup thing. Your voice sounds like it's being pushed in an uncomfortable way, like it needs to be warmed up or part of your throat is not keeping up with the pace. I usually do a bunch of vocal warmups before doing serious growls. Typically I do a few lines of mid growls, take 10 minutes off, then do some lows and highs for a couple minutes, take another 10 minutes break and drink some water. Then I do a fairly easy song a couple times, stopping for a section if I feel like it and jumping back in for the next part. Basically a full warmup takes around 30-40 minutes for me before I feel ready to use my full force.
Can't tell what you were drinking, but if it was coffee that will just dehydrate your throat. Room temperature water is the best way to maintain in my experience, and coffee might actually be the worst.
Another factor I'm thinking is volume. Optimal volume depends on the individual, some people need to be loud while others have a smooth mid-volume voice. I can't tell what the case is with you, but I myself lose a lot of consistency if I'm trying to growl more quietly or constantly being mindful of how loud I am to other people. I find it strains my voice more because I'm pushing and holding back at the same time, and my voice doesn't know what to do. It almost becomes a self-conscious feeling and that alone is a bad thing in terms of being able to stay loose and comfortable.
That's just speculation though, you may be more comfortable at lower volumes as some people are.
Essay complete. Not sure where all that came from. Sometimes my hands just take over and vomit out unfiltered TL;DR thoughts