Q: In Solo Fluxx, do Creepers prevent me from winning the whole game, or just keep me from being able to achieve Goals?

A: Having a Creeper unrelated to the current Goal prevents you from gaining that Goal, even if you have the required Keepers. Since it’s more about how many Goals you can achieve in the course of play, there isn’t really any way to “lose” the game unless an Ungoal is achieved. Then it doesn’t matter how many Goals you got…