Maybe systemd-homed is the solution you are looking for. The arch wiki has a page for it. And this can be better for your use case because only your home folder needs decryption and not the whole drive.
There is this to keep in mind since you are using KDE, but can be easily fixed: https://wiki.archlinux.org/title/Systemd-homed#Home_directory_remains_active_after_logging_out_of_Plasma
I have been playing Abiotic Factor with a friend. Most fun I have had since lethal company. Really cool progression and the map is just amazing. The new update has a few rough edges, but otherwise good.
As for single player, terrafirmagreg in Minecraft.