Hey! You can access the full build by supporting me on Boosty. This build would have bonus menu as well as exclusive scenes with Vlada (centauress) and Brynja (minotauress).
Yeap, that's what the demo is for. If you don't like the game - that's alright, you dont lose anything because demo build is free. But if you would like to continue in the full build - your save files would work just fine. In some cases I may need to fix some small stuff, but it would take about 5 mins for me.
And as far as I know Boosty has problems with paypal so I'm not sure about that, sorry :(