I checked out Battlestation: Harbinger a while ago (see my thoughts on it here) and thought it was a great idea for a space exploration game. The good news is that it's now DRM free on GOG with Linux support.
Really pleasing to see GOG add some more smaller, but good titles with Linux support. Hope to see more soon from them.
About the game
Battlestation: Harbinger is a hard sci-fi space exploration game blending roguelike, turn-based, star map strategy, and real-time space battles. You are a young commander given the task to venture out into enemy territories, far away from home to unknown galaxies, never knowing what you will face as you jump out from hyperspace.
Find Battlestation: Harbinger on GOG.
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