Thanks for the comments, everyone! Particularly for pointing out my boring camerawork. You're obviously right, I need to sort that out in the next film.
@ROC:
Haha, good spot with the continuity error! It's certainly not the only one, there's about a zillion in there. I normally take the view that nobody cares very much, and seeing as this is the only one to have been pointed out, I guess I was probably right.

Here's a few that I'm aware of:
-During the run-around-the-sofa sequence, the sleeves on the Scream costume keep rolling up and down between cuts

-As I walk out of the door to bump into the real masked murderer, the preceding shot shows me reaching the edge of the open door. After the cut I'm a couple of feet away from it again.
-As the guy whips out his knife, I punch him on the right side of his face, but in the insert shot of him falling back against the wall, he is clutching the left side.
-At 2:47, the door in the background is closed. After the cut, during the backflip stunt, the door is magically open.
Like I said, I don't think anyone cares. It's just fun to point out all the dumb flaws in your own movie.
Re the sound editing, some interesting comments. I kinda like my mixing to be pretty dry, but I will experiment with more reverb. All of the dialogue has got gentle reverb on it anyway. I dunno, I kind of like how crisp it is. Maybe it sounds weird to everyone else though. As for muffling the grunts, I tried digitally cutting some frequencies and it sounded shitty, so I gave up on that. I dunno. I guess there's no right answer really with sound editing. My own biggest personal beef with my sound cut is the total lack of room tone, which sounds hell of weird. I tried adding some subdued thunder rumbling, but that doesn't really help. I need to get a solution for that in my next project.
Thanks for the comments anyway. I'm a huge audiophile so it's nice to hear some feedback from someone else who actually notices and prioritises sound editing/design.
Above all, thanks to everyone for watching! I'm now certain my next film will be a lot better
