Thank you, we're really happy you enjoyed it and found it compelling!
To answer your questions, Invisible Beasts won't be long, we estimate around 25-30k words and a couple hours of gameplay.
The story line is only one, in which Fosco and Giovanna play different roles, both essential to the plot :D
Also, little hidden update, due to some changes from the "original plan" the endings went from 3 to 5 ✨
Thank you again for the nice comment!