Alien Tribe 2 (2013)

Alien Tribe 2 is an indie 4x space game that combines several genres. Imagine a universe sandbox meets real-time strategy and a pinch of tower defense and Master of Orion. The 4X stands for "eXplore", "eXpand", "eXploit" and "eXterminate", and Alien Tribe 2 offers all these different strategies for the player - from exploring the galaxy to extracting raw materials or fending off hostile attacks.