[Android] Free - Game Dev Story @ Google Play

Hasn't been free since 2013.

Manage your own game company and try to create a million-selling game in this unique simulation.
Features the ability to develop your company's own game console, plus a system for changing your staff members' professions.
Your staff members can have a variety of game-related professions, from programmer to sound engineer.

Credit to RentFree at OzBargain