Battlevoid: Harbinger (2016)

Battlevoid: 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.

Intense and gripping sci-fi space adventure simulation
Explore new procedurally generated galaxies each playthrough
Galaxies full of mysterious places and dangerous encounters
Carry out missions, discover new technology, and help humanity survive
Unique turret upgrade system, never seen in a game before
Superb pixel graphics and effects

MINIMUM System Requirements
Linux: Ubuntu 14.04, Mint 17
Processor: 1.8 Ghz Processor
Memory: 1 GB RAM
Graphics: 128MB 3D OpenGL 2.0 Compatible video card
Storage: 250 MB available space
Mouse, Keyboard

System: OSX 10.9+
Processor: Intel Core Duo Processor (1.8GHz or better)
Memory: 1 GB RAM
Graphics: 128MB 3D OpenGL 2.0 Compatible video card
Storage: 500 MB available space