Does anybody know about this title?
It's a half-retro FPS made by a single japanese(!) dev that takes a lot of inspiration from Marathon, Touhou, Doom, and cyberpunk/dark anime from 90's (GitS, Jin-Roh, Blame!, etc). The game, despite being a bit clunky in realization, has a good amount of effort and soul put into it together with a decent amount of gun autism (projectile ballistics, half-realistic reloading system, juicy sounds) + elements of guro and ryona (no porn) + fucked up cyberpunkish/religious setting, as if it was taken from some obscure japanese RPG Maker schizo game.
You can download the game here:
https://mega.nz/file/3klwRBzL#5czlduwGO1gQ2MmOi5pLnoJTp2tvBdoMVRDvQDwLfSYor/and you can buy it on steam to support the dev:
https://store.steampowered.com/app/1378290/The_Citadel/