Super Cane Magic ZERO is a game I showed off a little way back in April of 2016, since then it's had tons of updates and recently a big story expansion.
This rather fun trading card game has had unofficial builds that run on Linux for a little while now. I tried them out and it’s a pretty fun game, but don’t expect official support anytime soon.
Early last month we posted an article about the developer of Seven: The Days Long Gone asking on Steam about future platforms for the game, it seems they've taken note of all the requests for a Linux version.
The story of Earthlock: Festival of Magic is a little odd. The developer released a Linux alpha version back in 2016 and since then nothing has happened. A new edition has been announced and it's still somewhat positive for Linux.
Darkest Dungeon is about to get darker with a new DLC 'Darkest Dungeon: The Color of Madness' involving an alien shard that's crashed into old Miller’s farm.
Here's one we totally missed which looks very interesting. Just One Line is a fantasy gamebook-like RPG that's currently in Early Access and it supports Linux.