some of my idea that i didnt use:
1. management sim where you a barista serving coffee, but one of the coffee get poison. someone died. now you gotta find where or who poison the coffee. maybe other staff serving or another costomer?
2. exploration game where something happen on a location then that location become restricted. the player lose trust, and it keep making the player world smaller.
3. young handsome billionaire CEO have choose to accept or reject: invite, proposal or new friends because everyone just want his money. who should he trust?