For anyone wanting to try this - just watch a video. Its a 3 min walk.
For the dev:
Writing needs a lot more work. If you are comfortable to use your voice, you should use it for everything. Dump the notes. I only read the first one. The idea and visuals are great. Flesh out the character and the environment. How did all this begin? What was the player doing and how he felt about that? Also guiding the player with "hmm i think i should do this and that" is super over done and cringe. Find more clever ways to guide. You have a lot of freedom here in terms of writing, tell us stories from this world as we walk. Make me care about the character by hinting at his core desire and how his personality in the environment makes him act to get it, and what conflicts obstruct him from getting it. Write around your words and dont be blunt.
Great job on the demo!