We now know for certain who the developer behind the charming Yoshi and the Mysterious Book and it is none other the established, Good Feel. The news comes as the review scores have been dispersed and the in-game credits revealed Good Feel as the game’s developer. The team at Good Feel have been behind some classic adventures such as Yoshi’s Woolly World and Kirby’s Extra Epic Yarn.
Good Feel is the developer of Yoshi and the Mysterious Book

Explains how it failed royally.
Given that the game isn’t released until tomorrow…
Great as good feel they always feel like Nintendo first party quality
Game series previous developer for past couple of games turns out to be current games developer. Also water is wet. More at 11:00.