Nah there's no wizardry here. The game itself is actually very simple in terms of processing. You only see maybe a dozen enemies at once, if that, ever, and whenever you do its in a locked arena area. A tiny arena even.
As FPS games go, Doom is wildly simplistic, which makes it that much more impressive that it's as fun and repayable as it is. I personally thought the narrative actually managed to carry a lot of that weight (i loved the story) but it was also the gameplay itself - they did a superb job making the player actually learn the guns and why you'd use each one, rather than just letting them have a favorite.
Don't get me wrong though, I don't mean to belittle them. Doom is a chefs egg. Every cook can make an egg, but making a perfect egg every time is something that takes the mastery of a chef. Id is very much the chef in the analogy.
Deep Rock Galactic runs great and is a lot of fun. It is a bit of a battery hog though, so best plugged in or in short bursts.
Boltgun runs fantastic and is a great boomer shooter. The cutscenes don't work without a workaround, but there's 4 total and none of them are important anyway.
Doom Eternal runs beautifully, and is super action-packed and fun. Surprisingly good on the battery too for such nice graphics.
Lol nothing like 3% battery warning as you scramble towards the drop pod to really put the fear of Karl in you!
For real though a 25 minute mission easily eats 40%+ of the battery, no idea why it's so energy intensive. Mind you I've done zero tinkering, just playing it out of the box, I'm sure you could juice some more life out of it if you tried
nevermind, I realized it's a different term for FPS. Usually from a country where english isn't the primary language. neat! I like the name more than FPS actually.
Anyway, I'd recommend Titanfall 2, Bioshock, of even Halo: Master Chief Collection
Warhammer 40k Boltgun is super fun, though some people think it gets boring after the first few missions.
There's also Turbo Overkill, which definitely scratches that itch.
There's also Ultrakill, but I personally wasn't too into that as someone who sometimes just wants to shoot shit on his deck. (it felt a bit too puzzly for my tastes, not a bad game just not what I was looking for)
Edit: Boltgun required some media file conversions to prevent cutscenes from breaking on the deck. If you end up getting it, let me know and I'll link to the steam community post that outlines the fixes you'll need to make. Otherwise, though, a great game.
I’ve heard a lot of good things about Prodeus as a Boomer Shooter and it looks to run well on Steam Deck. Think I’m going to download it tonight myself honestly!
Anyway just found out about Battlebit. While thr graphical quality is like Roblox, it has a super high refresh rate, massive amounts of players, incredible customization. I'm very impressed from what I've seen and I've heard folks raving about it.