In that case, maybe look into the Itch desktop app?https://itch.io/app
That's not Steam, though :D But thank you anyway :)
Yeah, sorry, It's impossible within steam to generate keys for free games, the only option is to wait for release.
https://store.steampowered.com/app/1340810/The_Night_Fisherman/ It's up there now ;)
Thanks! :)