Hi Otomon, tech lead here, I just wanted to give an explanation wrt why we don't support other aspect ratios. To put it simply, the boundaries of the camera change if you change aspect ratios, so things which should be off-camera would be visible. That might not be a big deal for an FPS, but for a fixed-cam horror game it can really effect pacing, suspense and combat.
(as an aside, this is one of the reasons why the HD Silent Hill remasters aren't as good as the originals: the change to 16:9 gave you much better visibility than the game was designed to have, and often made the camera angles uglier and less effective)
But! We could add an option to stretch the screen horizontally (sorta like when you play GameBoy games on a GameBoy Advance) if that seems like it would improve your experience. The characters would all look short and stubby though lol. But if that's a feature people want I'm happy to add it in the next update :)