No, we can't "sell" it directly, so it won't have a public release.
It's getting a sequel, though :3 But on the same system of Patreon
Yeah, the choice bring you to one or another route, the main change are the dialogs, but the picture do change depending on the route too. Small change like emotions, creampie, clothes ...
Also, you tried max / min in the demo or in the full game ?
The change start to occur at the chapter right next to the demo