Cool work! I think it can be a nice addition even to broader and more classical TTRPG adventures for "Escort" type of quests.
Question: based on the "Guard the caravan. Don't die. Get paid" and specifically the "Get paid" part, have you thought of a treasure / bounty / prize system for which at every completed run the players can get some kind of powerup or growth?
I think it might add both motivation and replayability value.
Best!