This game is excellent! I seriously can't believe that one person's made all this. I just have one question: are there any plans for beefier weapons? That "new enemy model" scares the shit out of me, and I'd like something better than the pea shooter we have now if I'm ever going to have to fight it. Good job with that thing's introduction, I was literally peeking around every corner after that expecting it to jump out at me.
Also, I saw in another comment that you're planning on replacing the AI generated art at some point, and I know AI art gets a bad rap for some reason, but personally, I wouldn't change it. The art you've got in here looks good, and fits the ambience of the game well.
I'm looking forward to the next update!