There's quite a few retro shooters like that nowadays.
Prodeus, Ion Fury, Amid Evil, Project Warlock, Project Downfall, Hedon, Viscerafest... and those are just the ones I know about. If you include retro 3D (think mid-90s style) there's even more!
There's also a lot of mods and TCs for some classic games, like Doom or DN3D.
You should follow some gaming channels on YouTube that focus on retro shooters, they're a good source of new ones to play. I'd recommend ICARUSLIV3S and GmanLives if you'd like to find more.
I love this renaissance the genre is having, combining older aesthetic with better art design and lighting. Valheim comes to mind. I hope janky looking games but that are as deep as Deus Ex aren't far behind.
>And what I love about them is that they're able to just use the original engines* from decades ago
DUSK is a great exception to that, where they actually used a very heavily modified version of Unity to get something similar to ioquake or the early DOOM engines. IIRC most of the graphics programming was actually done to stop Unity from making the game "look better" :)
Amid Evil is another notable exception that I can think of of the top of my head: it uses Unreal4.
Oh man, Amid Evil is pretty crazy in that regard. All the game elements are sprites with depth mapping, so they react somewhat realistically to level illumination.
Prodeus does something similar as well. In fact, you can switch between 2D sprites and 3D models on the fly.
Prodeus, Ion Fury, Amid Evil, Project Warlock, Project Downfall, Hedon, Viscerafest... and those are just the ones I know about. If you include retro 3D (think mid-90s style) there's even more!
There's also a lot of mods and TCs for some classic games, like Doom or DN3D.
You should follow some gaming channels on YouTube that focus on retro shooters, they're a good source of new ones to play. I'd recommend ICARUSLIV3S and GmanLives if you'd like to find more.