Some tutorial or explanation would have been VERY helpful. At the start of a new mechanic it's good to handhold the first use of it. I wandered around throwing watermelon at nothing for a long time before realizing there were animals to be fed. It wasn't clear to even be on the lookout for it.
Something as simple as once the watermelon / pineapple, etc is picked up the first time, the camera is forced to look at a creature pop up, Maybe even show a label for a moment like "It looks hungry"
As simple as that and you'd be golden. Level two was very pretty, i'd almost say lead with that one too rather than the library. Much more engaging environment to be in.