G'day mate, after finishing your game and reading the end screen I decided to give my thoughts fully laid out in a comment. I would of done it anyway since ripping into stuff is what I do, but I also want to give you good and valuable feedback so,
Art Style: While I appreciate the attempt that was made, the lighting glitches that caused contrast between the lighter, lighting up the environment, and enveloping it in pitch black made it difficult to feel any immersion. Also the random blue loop doesn't fit into the standard white and black formula set up throughout the game.
Gameplay: PT PT PT PT, I may have a small personal vendetta against PT clones, while this one was rather tame in comparison it still committed a few sins, such as having events trigger without loud screeching noises to signify a random door can now be accessed, most rooms stayed locked until they were necessary to continue the game, leaving very little loop exploration possible at all. Not to mention the random jumpscares mostly tied to text popping up on the screen. When the font is literally more terrifying than the monster it is very hard to become actually invested in the game.
Story: Allegedly there is one, but it's one-note long and didn't tell the player anything besides that they're the bad guy, what a twist.
Improvements: Try to include the interesting black and white style in more situations, maybe the monster should be the only color in the game and mostly signified by his red eyes and sinewy carcass. Remove the pac-man minigame entirely and cut down the experience to just be PT with a bit more of a focus on action and events backed up by a strong art style.
All in all, for a game jam game. It didn't crash or cause my anti-virus to have a stroke so you did pretty good. A solid average rating mate. Full playthrough and cynicism below.