Stories: The Path of Destinies, currently free on Steam · 9:45am May 12th, 2018
Just log in, click the download link, and it's your's for keeps. Offer lasts the weekend out.
A bit on the repetitive side if you're trying for 100%, but it's a cool idea for a game. Basically being one of those 'chose your own adventure' books, but in action-adventure game-form.