[Graystripe2000]

This tweet shows a video of early footage of Moonlight Museum. It also shows that the game’s working title was simply “Klonoa”.
https://www.twitter.com/MiQooRi/status/918836834678988800

[Questklonoa]

Ooooh! Wonder when the early version of Moonlight Museum shown in?

[IsmaDLR]

It would be very interesting to know what's different between the footage and the final game.
With that we could have an idea about when the build shown on the fottage was made. Which I can assume it was made at, probably, two or three months before the official launch.
Knowing when was that footage shown for the first time would also be a great starting point.

[Voka~Daemyn]

Quite interesting