Really enjoy the concept of using a hotkey to navigate two layers of the same world, as well as making visibility a scalable metric. Though I felt there were too many things taxing the energy meter, and it made all-the-more likely one would hit the loss condition for short playthroughs.
Would've preferred the usual "WASD + space for jump" control scheme for right-handers, at least as a dual input option in addition to the arrow keys, so had to arrange my hands on the keyboard in an unfamiliar fashion to navigate the game.
I like the pixel art and sound for an 8-bit experience—one of those games where one thinks, I could totally see myself playing this on the NES back in the day.
Nice solo effort here—good work!