If you liked the atmosphere/mood of Nocturne, the closest game in feel is Strange Journey. If you liked the art of Nocturne, I’d suggest trying DDS or the Devil Summoner Raidou games, though the Raidou games are action games rather than RPGs and are also slightly budget/bad but memorable.
If you want a good gameplay experience where everything is smoothed out and user friendly, try P4 Golden or P3Portable.
If you like SRPGs or want the novelty of moving around a grid and attacking from distances and having several Megaten demon parties, the Devil Survivor games are pretty fun. I really wish #FE used the DeSu battle system instead of what they ended up with. DeSu’s story is a rechurn of SMT1 except more modern day and bad anime, but the second game gives you a hero and party full of idiots and puts you in the plot of Evangelion so it’s a lot of fun.
I know you said you can’t play 3ds games but: If you want to feel the cool occult mood of the original series, I really liked Soul Hackers on 3ds. It’s fun to see what they thought the “cyber future” of today would be like and how right and wrong they were, plus it’s got totems and spirit animals and North/South American gods and demons in the forefront which is kinda neat.
P2 is a good time for old game-style too. The PSP remake is a good way to experience Innocent Sin and has a remixed soundtrack plus new content that they didn’t finish translating lol it was basically create your own stories/dungeon mode and that’s too much text for a release as small as a PSP game.
Anyway this is on mobile so plz excuse my typos or grammar
I like Nocturne > Strange Journey > P4 in that order but they’re all good
Apocalypse is really interesting in how they basically made a fanfic of 4 and then turned it into a whole new game. I’ve never seen a company do that, it’s super neat. Like the game begins with your hero basically fucking up the perfect neutral end of the last game and then things go really south and you have to fix all your problems but also you have friends and a harem because now we’re post-P4 now and that shit will be in every Smt game cry cry ok bye