Cute game, has a couple of bugs with the UI (pressing Enter does nothing and the Pet Upgrades button doesn't not seem to do anything). This game also seems more active than what an idle game would suggest. Though I do see how it turns into an idle game once you get your pets.
Audio could be better with some munching sounds when you pick up munchies, also the Scooby Doo tracks are definitely Copyright Infringement.
Good effort, though!