First of all, thank you for featuring my game in one of your videos!
Second of all, WTF is this talent?!
When I first saw the theme, I immediately thought of the on/off switch from Mario Maker, but it quickly fell through because I don't think I can execute the vision well. And you are executed it beautifully.
Like you've said, the game play is inspired by Mario, though I think this game is closer to Mario Galaxy. Because only one brown lamp can be lit at a time, the "ON" part of the theme comes with its own pros and cons, and not "If I'm good enough, I can ON all the time". I have to carefully plan out my routes to progress.
I've heard you said you afraid the environment is too dark, but this combined with the light ball really encourages exploration. Because I can freely move in any given set piece(not between set pieces, which is what I think the barriers are for) as a light ball, I can get as much info as I want while keeping the claustrophobic atmosphere mostly intact. I went out of my way getting all the collectables because I know where they are and what to do to get them.
The story, while bleak, is hopeful and effectively explains the lore behind the mechanics.
Finally, say hi to Kory for me :), 10/10