If you are looking for a classic dungeon cleaning RPG expierience, I think you should consider trying out Tower of Time.
Don’t be deceived by a warm colour palette and soft visual style – this game has a lot of depth for the experienced players. If, on the other hand, you are a beginner when it comes to role-playing games, Tower of Time offers you a possibility of enjoying the game without tearing out your hair – easier difficulty levels.
The native Linux version works perfectly. It’s just install and run.
My specs are:
CPU: Intel Core i7-8700K @ 3.70GHz
GPU: NVIDIA GeForce GTX 1080
GPU Driver: NVIDIA 440.59
RAM: 16 GB