Cool game! Neat cinematics at the beginning and end. Gave me some vibes from The Forest and I couldn't help but think of the Island of Dr Mureau just by the title. Some of the rough bits, like the enemy animation not matching movement speed, almost gave it more of a clunky horror charm. Nice usage of audio throughout.
My biggest complaint is the collision detection and slope movement, lots of rocks to get stuck in and lots of slopes almost seem like the player can't climb them, until you get just the right angle.
One other suggestion is changing the underwater movement somehow so it doesn't feel the same as above ground movement.
All together it's a cool game! Nice usage of the theme and it's nice to see some focus on cinematics.