I recently stumbled upon https://github.com/citybound/citybound which draws inspiration from SimCity and RTC among others. The project is still in very early stages, but I thought it was very interesting.
Seconded. I can't think of any practical reason AGPL would be more restrictive than GPL to the player of a video games.
As a player, you only benefit from the AGPL, as intended. What makes you use the term "restrictive", unless perhaps you wanted to make a non-free derivative or use portions of it in non-free software? This isn't a library.