Hi, regarding the terrain issue
its not really a bug, you can read more about it here: https://itch.io/t/121858/demo-coming-soon-black-terrain-issue
Few players reported to me that by installing / updating DirectX & updating their video cards fixed the issue for them.
However, if you'd like a refund for the time being its not a problem please send me a request via the following link (please mention the email you used to get the game here on itch.io):
https://www.ashore-game.com/contact
Sorry for the inconvenience,
Thank you.