A fun little demo. A couple small criticisms:
When you get the Booster, you did an <EQ+ to activate it, but the flag that tells whether or not it's equipped is unset, so when you go into your inventory and select the booster, it asks you if you want to equip it, even though it's already equipped. What I would do is remove the part of the ArmsItem script that asks if you want to equip/remove the booster. Alternatively, you could remove either the <EQ+ or the <IT+ when you first get the booster, or you could set whatever flag is responsible for checking if it's equipped (idk what flag it is; you'd have to look at the booster's armsitem script).
I would reduce the lengths of the <WAIs in the Hermit's house; it feels like you're waiting too long. Also, you might consider putting something that makes it more obvious you're in a cutscene (i.e. an <FMU or a <KEY).