Ah, I can make Shoujo: Harem a sort-of elimination game. If you fail to buy a choice slot twice in a row, you're no longer a capture target, but instead, begin the path of a villainess. Your win-con involves reaching a bad ending; as the route gets locked in and more villainesses are born, it gets harder for the protagonist. Although... Maybe I should make the villainess resource pool shared, so that it doesn't snowball?