20's web design? I'm just gonna assume that's a typo.
The aesthetic seems *possible* with 2000's technology, but the style doesn't really feel like it comes from that era. At the very least, I never saw any flash games that featured this lineless art back then.
However, it is nice to look at.
I'm a bit confused on some of the other design choices as well.
The orange glitchy effect doesn't look like it comes from the same game, and blackish gray "glitch" that covers Toppy's face doesn't really look like anything in particular?
It's hard to tell from such a short demo, but it seems a bit derivative of Amanda the Adventurer and Andy's Apple Farm.
However, this aesthetic would be very unique for a FNAF game, as most tend towards a more realism based approach.
Also, there is a lot of spelling mistakes that do not seem intentional, including in the newspaper(?)
at the end.
As for the horror, there is potential here, but there needs to be more buildup and atmosphere.
Jumping the player with "spooky" stuff in rapid succession, especially in such a short game, reduces and even nullifies the effectiveness of the scares.
Don't be afraid to have stretches on occasion where nothing bad happens, but it *feels* like something WILL go wrong. Sound design is you friend- pick your sound effects and music wisely, and know when to bring them out and when to leave the player in unsettling silence.
In short, you've got a good start, but it just needs some more refining.