1. Record of Lodoss War - Deedlit in Wonder Labyrinth (PC)(Action Adventure)
2. The Citadel (PC)(FPS)
3. Gothic 3 (PC)(RPG)
4. Witchaven (PC)(FPS)
5. Unpacking (PC)(Puzzle)
6. Firewatch (PC)(Adventure)
7. Perilous Warp (PC)(FPS)
8. The Ascent (PC)(RPG)
9. Borderlands: Game of the Year Enhanced - The Zombie Island of Dr. Ned (PC)(FPS/RPG)
10. Borderlands: Game of the Year Enhanced - The Secret Armory of General Knoxx (PC)(FPS/RPG)
11. Borderlands: Game of the Year Enhanced - Claptrap's New Robot Revolution (PC)(FPS/RPG)
12. Kingdom of the Dead (PC)(FPS)
13. Monument (PC)(FPS)
Monument is much more of a "traditional" Boomer shooter. It's an FPS in the classic style, where bunny hopping is how you go faster, iron sights does not exist, health packs is how you keep your numbers up, and enemy AI mainly consists of run at you, shoot at you, or both. It was programmed by one guy, and while the Steam release has seen some tweaking, the game also surprisingly received a Nintendo Switch port. Is it worth playing? Well...only if you're really hard up for an FPS experience.
While Monument may fit much of the classic FPS frame, it also doesn't include some things that were still found in them, like story or coherency. In DOOM, text blocks told us what was going on, but level designs changed and adapted to tell us things about where we were, be in moving through hi-tech facilities, hellish alternate dimensions, or even the mean streets of Earth in DOOM II. We could figure out story of the worlds of Heretic and Hexen, Quake, Serious Sam, and so forth through enemies and level designs, and while it may not always have been blatantly obvious, it was still enough clues to piece something together.
Monument offers no such coherence. Enemies are apparently killer candles, fat guys spitting fire, skinless giants, teleporting aliens, and some kind of robed magi. Levels involve some kind of facility built out of caves...or caves built into facilities...or something. Are they extraterrestrial? Are they in Hell? I have no idea. The weapons don't convey anything either, instead just fitting your typical FPS roles and not always well. You can snipe with your hitscan shotgun, though it might be better to do that with your much more powerful but much slower hitscan rifle.
That's not to say Monument isn't interesting. Those candle enemies die in explosions or gas clouds, causing area denial to the player. The fat fire spitters lob single entries or go full auto in a deadly burst. The aliens teleport and can telefrag you if you aren't careful. There are ideas that are interesting, they just don't fit together particularly well. That's really the problem.
If you want a more consistent approach to old school FPS, there are a lot of options these days: Dusk, Ion Fury, Project Warlock, and so on all fit the bill. Many older FPS are also getting great remasters, like Quake and Blood. And even more obscure titles like Eradicator and ZAR are made playable on modern computers. Monument doesn't do much to stand out against all the other options. It's something you can hold off on while going through all the hundreds of other options you have at your fingertips on Steam, GOG, or wherever you're buying your FPS games these days.
Unless you want an FPS on your Switch, in which case I don't know what other options you have but hear the port is quite playable.