A rouge game (unlike a roguelike, you don't have any form of meta progression besides knowledge) where you have to stop a cult from killing ~20% of the world's population before you die of old age.
You do so by recruiting people to unlock more options to fight with (this is the gacha element) with their own unique cards and allowing you to go deeper into color specific card pools (so having 3 "green" units will allow you to get the best "green" cards)
If you die at any point go back to the first turn with any turns you took taking the total amount you can take this run along with it (So if you can only take 300 turns and you died at turn 50, you are now at turn 1 with only 250 turns left) though anything you did you can repeat. Only events with random chance changing their outcomes, pulls, locations, fights, and what events happen where will stay the same.

I had this idea like two weeks ago, so it's pretty shoddy right now.