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Risk of Rain 2 and Robo Quest are probably up your ally because you like Ultra kill
But if you want to diversify genre, here are some that I would recommend
They should be a hard requirement to anyone that wants to access the internet by now. Although the ones built-in to the operating system such as Gnome keyring, Kwallet, Windows Credential Manager and Apple Keychain are OK, the third party ones are 100% better.
Personally I use KeepassXC and just have it synced across different devices via Syncthing. While I also keep weekly backup copies (without the Key file) on Mega with it zipped and password protected.
Linux always had software that has anti-cheat. First one I can think off that is both a native Linux application and has anti-cheat is Tibia. Aside from that are Valve games. I am sure there are plenty of others too aside from those that opened up through Proton/Wine.
What we don’t have is kernel level anti-cheat and honestly I would rather stay away from games that deploy it than allow such software running in my computer.