Hi and greetings from the stream! As promised, I finally got the time to play your game.
I reeeeeally like the concept and idea. The relationship between the "scaling screen" and its effect on the FPS world are sooo well executed! Seeing the giant moon in the sky was a great WOAH moment for me, as well as as seeing the water level and heat / cold relationship.
About the gameplay, I don't think I can add anymore than what has been said in this comments before. It's easy to cheese some sections, but don't let that deter you. These are no big issues and if you were to go back to the game, some iterations and in depth playtesting will do.
Overall great fun and some interesting ideas!
Also, have you played Outer Wilds? The transition between FPS and Scale mode, gave me such vibes!