First, it is not recommended to submit a first draft for review. A first draft is always bad. It's just a starting point to rewrite from. At this stage it's difficult for anyone to review you work because you haven't really got it to where it needs to be and its hard for the reader really dig down into where you might be going awry.
That being said it has the basic elements (bar one) that you need for a decent story and the action (and there is a lot of action) is clearly written, which is always a big tick. The potential is there.
The subject matter deals with demon slaying in the most part by a near indestructible super hero. I could see it aimng for the heights of Buffy the Vampire Slayer, Hell Boy or Constantine.
The one basic element that these shows/films have the SVF doesn't is a clearly defined world. Descriptions of locations are sparse, vague and very basically named in the slugline. A lot more thought needs to be put into what world you are bringing the audience to. How are the borders of Hell defined in this world. At one point a bunch of students know exactly who SVF, so this is a world where people are aware demons and monsters exist. But we never get a feel of that anywhere else. Everyone seems pretty prosaic about it.
Defining this world is going to help you with the next concern of the script: What is the story?
You may say its about SVF defeating the Devil. Good vs Evil. (or at least semi-good). But these are just trappings. You real story is going to be defined by the characters. Who is SVF and what does he want. What's his weakness? What's his fear? At the moment it feels like all your characters are being forced to dance along like marionette puppets through a very basic plot.
All those opening monsters he battles have to mean something. Each battle has to have a deeper reason behind it, other than you want to see some ultra violence. If they don't, the audience will not care a jot.
SVF's backstory is he had a car accident, the devil, for some reason tried to turn him into a killing machine, succeeded, but not really and then he hooked up with the mayor of a town who uses him like a pest controller. There's a lot of `"whys?" there. But you also have an interesting hook for your character that you never explore. Who was he before? Surely that would be what drives him towards some third act revelation, probably from the villain or a close close compatriot who turns on him.
The major issue overall though is do you have a unique concept. And I would say know. This has been done, and its been done a lot better. You definitely need to find a better angle on how you approach this. What is going to make your film stand out above all the others? Why is this film right for now? Don't abandon it, but you really need to answer those questions to make it worth you while.
The above should be a good starting point for redrafting. There are lots of other issues but I think you'll work through them as you tackle these problems.
Keep at it!
