Hi! I might be willing to go open source once the project is "complete", but that will be some time considerably in the future. It will remain free forever though: that is not just a goal, it is a promise. :) (If my promise needs backing up, Demon, my other game available on itch, remains free and was in active development for close to a decade. Demon does have a "tip jar" sort of thing set up, but payment is strictly optional.)