I'm not sold on the color palette in use here, tbh, but it looks like you made do with it as best you could.
Story-wise, I can only conclude that the player is a villain. An indigenous revolt against a colonizer? The colonizer is the villain there. You are sent with the express purpose to quell the rebellion, making you an accessory to the colonizer. Not sure what the sinister thing beyond that is, since I couldn't find the second key in town, but from what I got of the story you do not play a hero. What better horror than realizing you are the baddie, no?
Music is spooky, and loops well. The lack of sound effects made the game feel like it was missing something though.
In all, a solid entry.