WELL DONE! Great, great idea! Superb! I wish I had thought of it! The concept is great, the execution is awesome too. I understand the narrative choice of not including a minimap, but I missed it. Or at least something to remind me that I had to move in a certain direction.
I would have been more inclined to explore if I started the game in "the middle of the map", you know. The way it is It's like I'm leaving my house. So I felt like: "where should I go? I don't really wanna go anywhere, I want to navigate this thing!"
Now that I think about it, maybe a short tutorial level would come in handy, too.
You should definitely keep working on it! Way to go! Inspiring work!
*edit> I went back to check on the soundtrack. I found it too tense for the game. At least for the first contact with the controls and gameplay... Maybe it's the environment art?