Hi there, so sorry this happened. We introduced asynchronous level loading with update 1.5 so this may have been an unforeseen consequence..
Would you be able to send us your save file? You can grab it from the following directory:
C:\Users\YourName\Documents\My Games\Sunken Heads\Saved Games
You can email it to us at horseheadinteractivegames@gmail.com and we will have a look. In the meantime we can suggest reloading from a previous save and going to the island again to see if the issue clears up.
EDIT:
We've fixed this issue with a small patch today. Thank you for bringing it to our attention. You can download the new version with the fix. Unfortunately your save game is probably in a broken state. You can restart from the beginning or a previous save. You can also email us your save game and we can modify it and send it back to you.
Thanks again!