Alien Tribe 2: 4X Space RTS TD

"Alien Tribe 2 is a 4X space strategy game with real-time strategy and tower defense elements. Lead your alien race to explore, colonize, and expand across distant solar systems while battling against the hostile Malloc. Develop new technologies, terraform planets, and build an ark ship to ensure your race's survival, reaching the top 10 in the strategy games category in over 35 countries."