Thanks for playing! Amulet increases the invisible "luck" stat, which determines the percent chance that balls you shoot will have a "trait" on them (Undead, Flashy, and Hefty are all traits that affect balls randomly instead of all balls).
And totally get what you mean, I think maybe I could place levels in a random order and scale difficulty accordingly? As in, the further along on a run you get, the less balls you're allowed to use. Lots to think about, excited to make a more refined version of it!