We live in the age of the little book. Back in 2014 this one was published. I'd not seen it but enjoyed reading it recently. I guess itis from a sermon and in some ways a balance to Kevin DeYoung's Crazy Busy. Both books are worth a read. One mistake in the transcription is the appearance of the phrase "its dreadful, ravishing impact" on page 29, which should surely read "its dreadful, ravaging impact".
Bonhoeffer uses a similar phrase 'worldly Christianity'. It's J Gresham Machen that I want to line up most closely with. See his Christianity and culture here. Having done commentaries on Proverbs (Heavenly Wisdom) and Song of Songs (Heavenly Love), a matching title for Ecclesiastes would be Heavenly Worldliness. For my stance on worldliness, see 3 posts here.