(I know you didn't have time to completely finish this GDD, so no worries about the bits you didn't get to.) This sounds cute. I like the cat and dog characters, and the idea of a co-op game where the other character doesn't get along and does unhelpful stuff to mess up your strategy is funny. You have good ideas about how they interact with different props and animals. But it feels like you're not confident--you say a lot of "could" or "might" and hedge your bets by saying things like that it could be either isometric or top-down. I really want you to commit and decisively lay out what your game is going to do.