Rogue Legacy 2 from Cellar Door Games is a "genealogical" rogue-lite following the popular gameplay idea from the original, where you die and pass on your skills and continue to grow through new characters.
While there's currently no platforms mentioned for release since they've only just begun teasing it (there's not even a trailer yet), it's likely it will come to Linux since both the original Rogue Legacy and Cellar Door's other title Full Metal Furies were on Linux and they were ported by Ethan Lee.
Check out some screenshots (click for the gallery):
Rogue Legacy 2 is a genealogical Rogue-LITE. That means it has all the trappings of a typical rogue-like (randomized runs, changing characters, and more), but with persistent upgrades, and persistent dead heirs. In this game, the grind is optional. Play well and you can dive deeper into the depths of the ever-changing world. Or don't! Who cares! With hardcore platforming mixed with a deep RPG system, everyone can win eventually.
You can wishlist/follow Rogue Legacy 2 on Steam.