I mean Luna seems like an interesting game, but... HOW?

I can't interact with star circle around the moon at the level with the lighthouse and the owl. Just nothing happened. What need to do there?

I bought and installed the game after the non-VR version was added, but I get a Steam error when I try to launch it. Seems like the folder for the non-VR version is missing on my pc (LunaWindowsNoVR). I only see LunaWindowsOculurVR and LunaWindowsSteamVR. Any thoughts on how to fix this?...

How can we unlock it ?

1. Are there any promotional or exclusive bonuses that I have to worry about missing out on? 2. Is there anything permanently missable, even rewards for beating the game a certain way? 3. Are there any rewards for having save data from a different video game? 4. Is this game identical on all platforms, and is it available on systems besides PC and Steam? (I mean PS4 and Steam)...