As on a board game you can perform certain actions per round with each unit to capture with the aim of certain points on the map. Move units, recruit, let them fight. Kept quite simple in 2D principle comes at a lot of different ideological units with different characteristics quite well on fun for strategy fans. The main difficulty is to use the intelligent placement of units to terrain advantages or disadvantages to be avoided. Archers should not stand in front of the infantry, for example.
If one presents the difficulty of AI on the hard difficulty level is acceptable.
+ No dubious approvals which it has to approve
+ No advertising
+ Is stable and free from bugs
Lovers of the genre a try.