I really like the concept of this, I won't give away too much seeing as you have things behind spoiler warnings on the page. That being said I wouldn't have known what to do without checking them!
Exploring was highly enjoyable, what a unique way to navigate and build a picture of the world. Very atmospheric and just the right amount of eerie. But still relaxing!
If you wanted to keep the mystique and also make the game more accessible, how about giving the player all the controls, but not telling them what the "secret" ones do! The player then knows that there's more to this than meets the eye and they can take their time exploring and finding out for themselves. However this could also end up being frustrating so it would need to be done right.
Excellent work! :D