Recs.
Updated
Star Traders 4X Empires Elite is a 4x strategy game which has in app purchases. Refugees of a fallen space empire must carve out a new niche among unknown worlds. Balance construction and maintenance costs against the needs of a growing nation, recover the lost technologies of the core worlds, and secure your citizens against strife from both external and internal sources.
Specs
Pros
Pro Complex, multifaceted gameplay rivals desktop 4X titles
The depth of simulation in Star Traders 4X rivals that of the Galactic Civilizations and Master of Orion franchises from which it draws clear inspiration, and yet it's no simple genre clone: there are plenty of original ideas here.
Cons
Con Intriguing internal-faction system is poorly executed
Quoting pockettactics.com:
"In a strictly solo-play title whose main distinguishing feature is this faction system–the idea that you’re not playing as an ideologically pure civilization so much as guiding a fractious, corrupt plutocracy–you’d hope that those factions would be colorful and easily distinguished from one another. [...] Instead, what you have are two sets of three factions, each positioned, lore-wise, as starkly different from the others, though mechanically the separations are minor."