I have also a couple of ideas of a "fun" games - I have no time to implement them because I have my own projects :-D
Someone make BoozeField / WineSweeper game where your mission is to step on the field avoiding bottles. If you step on one, you get drunken and your aiming goes hard :-P In the end you either survive or get die because of promilles..
Other one: Lemmings meet Pinball. Those furries try to escape to the "void" (suicide) while your mission is to hit them back to the top by using flippers
Hilarious.
BTW: test AmiBlocks from Aminet and tell me your opinion, please! ;-)