First of all, I'm a prologue person myself. The way I see it, if an agent requests a partial, you should probably send that prologue or opening. If you're not going to send it, why write it?Second, I like what you have. Mostly. You have good voice and tone going on. Sometimes it's the author's voice that is the strongest when you're writing thrid person, but you pulled it off with flying colors. This isn't some writer telling me what's going on, this is a guy facing what I can imagine will be a very gruesome end.
I got a little hung up on minor flaws. Maybe they were strictly stylistic, but things like the "!" after "amount of fear!" seemed almost silly. Also, I didn't really understand who had the "extraordinary amount of fear!" Was it the creature? That's how it felt to me.
"Daunting" didn't feel like the right word. You've got all this raw emotion building in a pressure cooker. Daunting tells me you took off the lid and a bunch of the steam escaped. Get a harder hitting word in there.
The next paragraph opens with a sentense I think should probably be two.
"It was then that I knew that this was the end, and my life’s work?"
This should probably read:
"It was then that I knew that this was the end. And my life's work?"
Oh, and I'd cut that second "that" right out of there. I use the "Find/Replace" function and cut all the "that"s and "have"s that I don't need. Otherwise you can get bogged down in the language.
The only other thing is the line:
"And now, with only seconds away from my most inevitable death,"
I get that his death is inevitable. I don't need the "most" part, and actually, I don't need the inevitable. I'm not saying you should absolutely cut it, but the "most" feels weird. Like over-writing, maybe? I'm not sure.
You've got a good start here. I hope you keep going with it. It's not my usual cup of tea, but I like it. And please only use what you agree with. This is just my opinion. Throw anything you don't like right out the window!
Good luck!