Thank you for playing!! All dungeons have 2 chests except the tooth dungeon. Was it the ball of yarn you had to bounce on that gave you trouble? It is kind of a tricky jump, you want to aim for the center and let yourself bounce on it a few times to get height.
The Greater Catsby himself doesn't have a hit box (but he does have puurrrrsonality and is quite the talker).
Ramming the objects in the feeding missions is the best general strategy, they cannot get out of the area so you don't have to stress too much.
The game was designed to be chill and taken at your own pace with lots of funny little set pieces, jokes, and "lore". Im glad you appreciated that!
(until you realize there are 2 speed run timers....I'd die a happy man if someone speedran this game for GDQ!).