I don't know if any of these are specifically drawn from other games, as much of it is math or just good game design in general.
The only specific areas that I think truly get drawn from other games are the event minigames that are a little more creative, and by that I mean:
- Cookie Clicker - St. Patrick's Day
- Any sort of bubble buster, but specifically Candy Crush - Wildlife
One thing that I *do* wish would be drawn into the game is something that I saw when I used to play Tanki years ago, and that was a sort of GBG-ish system (specifically that of War: Domination). Basically the idea was that you'd have a map, similar to a GBG map, with different factions (sort of guilds) each having a capital. Then, each player in a faction could choose
one tile daily to put their attacks towards, and they could not change it once chosen. Then any battles they'd do in the main game would count towards the war. At the end of the day, whichever faction had the highest attacks on a tile would own that tile, which would then contribute victory points. At the end of the time period, the faction with the most points got exclusive rewards (as well as rewards based on your personal contribution daily).
I think it could be really cool if something like that could be built into FoE, with maybe instead of counting fights (since they can be farmed easily), something more like quest completions or a more Castle System kind of points being used, with an upper limit. To balance it better for less of one guild dominating, maybe split the
entire game world into three or four factions to duel it out? Idk. Never going to happen, but would be fun.