This app was mentioned in 5 comments, with an average of 2.00 upvotes
I haven't played it yet but Birth of the Empires is a reskinned, ported version of the Star Trek 4x game Birth of the Federation that came out in the late 90s. Might be worth a look-see if you're interested in a space 4x.
And while it plays like Civ-Lite, Sid Meier's Civilization Revolutions 2 is a fun diversion. It won't ever replace the desktop version but it's fun enough to play when you have time to kill (and it's got a decent amount of content for its asking price).