Hi.
What i meant was, making a complete game. Like, IDK, more levels, enemies, etc, compile it and upload here with a price. While also keeping your current project as a demo version. (Not the source but the compiled app) like you already have in Play store. That could be renamed as 'Warrior level maker demo' and then you could have a 'Warrior level maker' as full game with a price.
So far i am not having anything for sale in itch.io . But when you upload a project here. 'Dashboard -> Create new project' you can add a prize to the different packages you upload.
I don't know how licensing in direct deals work either. Just shared some ideas.
Perhaps i misunderstood. Do you want to sell the whole source code to a single person/studio? or want to sell it as an asset, blueprints, etc. to anyone interested? (several unrelated persons i mean)