To be honest, I made this because I had similar reservations myself. There are some notes about what's been cut from the rules in the appendix, but the full game has more than I could list there: more settings, scenarios, fish, animals, and player options. It also has more guidance on running different types of game (one-shot, interlude, collaborative world-building, campaign play) and for a broader audience (while I allowed myself the luxury of assuming an audience with a similar background in RPGs to my own).