Want to start off by saying that I have never played Silent Hill, and that being said. This game makes me want to. Because honestly, this was a blast to play. The puzzles, the scares, the atmosphere, the music; all of it was REALLY well done. It's amazing what you've done with the game. (I made a good video down below if anyone's interested!)
So starting off, I just want to say that the haiku puzzle. I loved it. It's been a while since I've come across a good puzzle game which doesn't just have a 'get this and go here' puzzle. And I loved the way you used the haiku syllables and the crossed out one as a zero. Figuring it out was really fun and felt like I was actually smart for once. Though that was the only main puzzle, the rest of them were getting parts and keys together to get stuff from rooms, which isn't so bad, but I guess you can't have five big puzzles; that might be super frustrating.
The other thing were the small jump scares. You did them really well and in times when the player thinks everything would be normal. Especially the chairs one; that almost gave me a heart attack. The one where the body was floating in front of the door, loved that too. Especially when you walk towards it and the camera transition makes it go away, it was really spooky and well thought through!
The atmosphere was absolutely amazing, the music and graphics really went together as a whole and even when nothing was happening, it gave this air of mystery and kept the player slightly on edge throughout the play through. I loved the dark undertone of the graphics, even though it was made to look like old graphics, it had this darkness to it that really shone through (ironically).
And there are not many things I would suggest to change. One big one was movement. I know you were going for a old Silent Hill type game. But even so, a little bit more easier movement would be better. The hold control to melee thing was not the best option, I don't think at least. It would slow down combat in the future and probably not the best for multiple enemies as you would be locked in place. I do understand you are trying to emulate the older games' vibe, but there's nothing wrong with having more modern controls and still getting the feel for those type of games! The comabt was interesting, but it was anti climactic because if I just stood in one place and whacked at the enemy, he died (as you can see in the video, was funny though!) and that wasn't hard, but would be hinder some in future updates when you add moving enemies and multiple enemies, so a different attack system would probably be better. (Maybe keep the pipe as a weapon class and you can attack others just by pressing the left click and no need to hold the control key?) And also the movement in general, it wasn't too bad. It definitely took time to get use to; but it wasn't the most easy to use while running around.
Also, adding a screen at the beginning where it tells you the controls or maybe a small Ui to indicate you have an inventory would be good. I didn't figure out that I had an inventory until towards the end.
Aside from those, I am looking forward to the story playing out (you set it up to play out I think, and saw the cross in the inventory, so that is definitely something that will eb used in the future, unless it's an Easter egg that I'm missing. and see more great puzzles because the haiku one was really well thought out. One fear I do have is that we will have to go through everything in this game again in the next update, so maybe have a save system where we can jsut drag and drop the save file from the old version to the new one? (I've seen this possible on visual novels, hence I'm suggesting it.)
But yeah, I'm really sorry for this long, long, long review. It was honestly a blast to play and didn't even notice the twenty minutes fly past. The game you've made is amazing and can't wait for more, And definitely would love to see a high-res version of the game when you have the time, people and budget to make one; it would be a really fun game to play. But other than that, keep doing what you're doing because it's honestly a really fun game and good luck for your future projects!