This is a VERY interesting interpretation of the theme, and the color lensing effect is both subtle and revealing. The music pieces are each in of themselves fantastic; even if they don't quite fit or transition well when switching lenses.
The game could communicate death better than with an instant next frame respawn. Player motion and acceleration could be softer and squishier, jumps a littler airier on ascent and faster on descent. (the character feels heavy like a brick)
The demon world was a fun surprise, but weird because suddenly you have colliders in the other lenses that weren't there before.
Overall one of the stronger entries for its cute and creative graphics, and a grey in grey game world that feels like it is just holding something hidden from you until you look closer!