I've just unlocked the game through the link provided for Gumrond buyers, however I have no idea what should I fill in to the login page, I've tried to put my itchio account ID in but it just doesn't work, and I've go through all the discussion board and announcements but found nothing helpful.

Hi, simply follow the steps ingame:

- Click Login button

-> It will take you to itch.io via a browser

- Login to Itch.io using your Itch.io account (it will skip if you logged in already)

- Click Authorize

- Itch.io will give you a code and tell you to paste that code to the game. Do it as they said.

- Back to the game, paste the code Itch.io gave you. 

- Enter