I have mixed feelings about this one.

I love the fact that it specifically talks about the different ways someone can 'ping' - that the ways we show kindness and affection are different for everyone.
I also love how it teaches that you are never owed a 'pong' - that whether someone responds to our kindness, how they do so, or when, is not within our control and should not be expected.

The overall moral and core of this books is something I truly love.

However, I found the layout, and the extension of the metaphor itself to be really confusing for me:
The sentence text is often in strange places on the page so can be hard to follow.
The illustrations of the little Ping within the ping-pong ball were honestly a little unnerving.
And the metaphor itself just seemed to go on for too long, and it kept adding on more information to the point where it just overwhelmed me too much.

I'm not sure how well children would relate to this without firm structure and explanation from an adult, but it definitely carries a moral I would encourage.