Though the execution isn't perfect, points for 1) being an actual working GameBoy submission and 2) telling a short but complete story.
To elaborate on both: making the engine in just a month (or, apparently, even less than that) is an impressive feat, but the ergonomics feel unpolished. I have mixed feelings about the inability to make text scroll faster; intentional or not, it works as an artistic choice to establish a set reading rhythm that the jumpscares then interrupt, and might not be a huge issue for a game of this length anyway. Presentation of text is pretty rough even by GB standards, however. The font leaves a lot of horizontal space between letters while pushing lines against each other vertically, and only having two of those to work with means that most paragraphs have to be split across multiple text boxes. The UI is tiny even in comparison to the average visual novel – I think you could safely dedicate more screen estate to the writing.
As for the story, considering the word count and the submission looking like it's more focused on the novelty of a GameBoy FVN, I feared it would be very barebones. However, the game manages to channel creepypasta energy in a way that makes its brevity feel purposeful – actually, I feel like things could go even further in that direction, since some of the more traditional VN elements come off as out of place. I'm not sure if the roommate's presence really adds anything, for example, and at the same time, the monster remains pretty vaguely sketched for being the central horror element in a horror story.
Even though the game comes off as a bit tongue-in-cheek, the claustrophobic, heavily stylized GameBoy presentation and the pixel gradients do evoke a mood. It's a nice experience for what it is.