Wow interesting game! I love the idea that the dice spawn a world, and the story generator is a nice touch that adds allot of depth to the game! I also really liked the dice designs that come up when you finish creating them!
You mentioned in another comment that you struggled with explaining the battle part, from my experience, rather than explain in text up front (especially if there's maths involved), its best to show the player what to do, as they are doing it. Also i think showing the success rate of each sticker packet as you choose them would be helpful, because currently I have no way to know witch stickers are good or bad!
Overall I think this game is quite clever, the artstyle is really nice and the whimsical tone makes for an entertaining experience!