I hate to come off as mean, but man this feels super undercooked.
It feels like there's potential for something there, but the brevity of how it ends at how brief it is really makes it feel like the start of something much longer, only for that to be it. It feels like you went to all the trouble with the Windows OS and the honestly cook 3d model that was only on screen for like 2 seconds
In terms of critiquing what's actually there, I have a lot of different qualms about it.
I want to forgo pointing out some of the cliches and typical tropes done in a lot of other creepypasta/horror stories because I don't like to compare, and I think anything can be done well enough and differently enough to be it's own thing. That being said the way story feels like a quick synopsis of itself, as well as SRB2 being solely unrelated to the story
Part of me feels like I'm maybe missing some big secret (particularly with that one Ffower room) but I think this feels like rushing homework on a topic you could get an A+ on
It needed more time in the oven, to establish the characters, and maybe rethink the narrative medium it's told through due to it's seeming irrelevance
The "villain" feels very slapdash, only existing to aura farm at the very end
Again, I get some of what you were going for, this feels like a v0.1 of a bigger project, I'd love to see you expand on this more.
I'm not going to rate it a 1 because I didn't hate it,