Wow. 😳This started strong, then I got to the second area and the game world opened right up... I'm going to have to come back to this one... 👍
This is amazing, really channelling a sort of N64-style sense of wonder.
One little thing, I had this one issue in the first area after picking up the weapon, where Left-Clicking would consistently reveal and unlock the cursor, in turn unfocusing the game. I found that holding any mouse button mitigated this issue in the short-term, plus the problem stopped entirely once I reached the second area.
Edit: okay, just noticed you're already aware of the bug 👍