No. The graphics being ultra-posterized is not inspired on Graveyard Shift at Freddy's. The window in the office is not inspired by GSaF. The hat teaser is not inspired by gee saf.
The graphics are inspired on Buckshot Roulette and TRtF 2: Windows 98 edition.
The window in the office is inspired by Five Nights at Candy's, and this was in the old 2021 game which was created and released THREE YEARS before GSaF came out or even that version began its development.
The hat teaser is inspired on the 2015 teaser for FNaF 3-4.
If you were picky you could maybe say "Hmmm but the angle is similar" and I'm just not going to spend more time on this.
Please do not relate me to Theresnosteak. We are not related. We are not friends. Thank you.
