Nice work, I like how you started to vary the scenery in later rooms, I would also vary the scenery in the second room because its more or less the same as the first room. The treats don't get used for anything, so after getting through the first room I stopped collecting them, there's no real reason to collect them. You could add a character that will exchange a key for treats, or add more variety to the dialog when collecting a treat to create more interest around the treat component.