Its would be nice to get this game on Gog :D
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I'm not sure that's possible. The Illusion software Runey is using has a somewhat complicated license.
As far as I understand, he contacted the company, to be sure that he was in the clear, and they gave him permission to release under a "free with benefits" license: he can get Patreon support , and release to patrons first, and he can get donations for the final versions, but he cannot sell the software, per se.
He would have to contact Illusion again, and get permission for a full commercial release, which is definitely not impossible - as long as they get a share of the royalties - but it does mean extra legal hassle that, at this time, is probably not worth it.
So... Maybe for the final version? Don't despair, but also don't hold your breath.
They do.
He's using Honey Select to make the pictures and videos, and the 3D assets he's using are not licensed for commercial reuse, including any render thereof.
He got explicit permission for the current monetization model, so that is perfectly fine, but selling the software on, say, steam or GOG... That would run a lawsuit risk.
The situation is even more complicated now, since Illusion no longer exists as a company, since he would have to track down who owns the IP.