What a pretty interesting topic or question you have here mate. My answer for this question is idle heroes game - have you ever heard of this game? Idle Heroes is completely free of charge and is fully optimized for the PC but they are working on the iOS and Android version to make it more stable. I really enjoyed all the challenges on this action strategy game and you can also socialize with other players on the game which is awesome in my opinion.
Well, I have played a lot of games in my life. These days I am not liking to play Hitech video games. I am playing simple games now. Last week, I have ordered this game https://productz.com/en/atari-5200/p/W596 and yesterday I just got the delivery of it. I am looking for more games like this if anyone can suggest them then please let me know.
And I don't really like old games, because as a child I didn't have a console to play them. Therefore, I do not feel nostalgic. But there are a couple of games that even I remember. For example Mario.
I really enjoy playing play, roller coaster tycoon, Dooms, Baldur's, Icewinds, Fallouts, Dungeon Keepers, friday night funkin, Quakes, Deus Ex, Thief 1 & 2, System Shock 2, Jedi Knight II - Jedi Outcast, Theme Hospital, Splinter Cell , Total Annihilation, Homeworld Cataclysm, Neverwinter Nights. Probably quite a few more i can't remember right now.