False Advertisement. It's a test game all throughout.
It states in development in the status.
The beauiful screenshots don't reflect the actual state of the game though. They suggest a rather developed state which surely isn't the case yet.
Arguably, this should be more prominent, but it is not your fault that itch.io requires a click on 'More information' to see the status.
I think “Prototype” would be better than “In Development” in this case