1 - The game is fan made and free.
2 - Me and McFord draw these sprites on our own, it just drawn in the same style. I don't think this style is patended.
3 - Do you even know who to ask for this permission, if it was needed?
Yes, there are a lot of plans with this game (most of them are generated by McFord who helps me a lot) but right now we are super slow with it because of other game, that we want to finish - The bartender
(other reason of this slowliness is that game already has its ending and seems like finished right now)
Also can you share a link to your stream recording, if you have one? I'll be glad to watch someone playing my game c: