For Age of Gods Online, Ai-chan get references from the game Dominions 4. There's a Dominions 5 now with more accessible gameplay but missing the amazing soundtrack from Dominions 4. Guess they didn't have the copyright to use it for Dominions 5. It isn't an outright copy of the system, but the gods themselves are inspired from the game system.
Ai-chan doesn't make other litrpg anymore. So that's pretty much it. There is litrpg element in We Are Here, but Ai-chan is going to remove it. It's disrupting the flow of the story.