Chasm: The Rift (1997), a time-traveling QUAKE-style FPS by the Ukrainian developer Action Forms. The game is graphically impressive, because despite using 3D models, the level design/geometry is all 2.5D like DooM. Also, chunks of the enemies' flesh breaks off once shooting at any part of their body (shoulders are more noticeable). The game is, like I mentioned before, has a time-traveling plot, like QUAKE was going to have. Did I mentioned that it is fun and has a NightDive-like remaster on Steam, GOG, PS4/PS5 and Nintendo Switch?