Hello, thanks for your feedback !
Yes "1D4 - 1" means "1D4 minus 1". Effectively, the idea is to jump from world to world until the result of "1D4 - 1" is equal to zero, your initial world.
This game was designed to solo sessions (journaling) with no time constraints. But i thought that a 36-word had to be a short experience.
Actually, this micro-game is a kind of draft for a longer RPG (at first a one page RPG before maybe a longer one) with more random and (i hope to succed it) more connections between worlds (like a technology from a world used in another world for example).
Sorry for my english, i'm french.
BTH