Thanks for checking out the demo! For what it's worth, you might be able to see some items that you can't actually collect until later (similar to a Metroidvania).
If you're talking about the Philosophical Slime's chip, you won't be able to get that until much later. However, it's possible to do the 15-sec pinwheel minigame right now. You can drink some black tea with Camellia beforehand to give yourself a speed boost, but it's not necessary. You have to hit all of the pinwheels to win the minigame, but they can be in any order.