This is a really, really REALLY good GB-like game, the gameplay is amazing, I was expecting a very basic "camera to see things that are not there" mechanic just based on the title and premise; What I got instead was a fullblown game with different mechanics, a nice variety of music, beautiful array of maps and enemies.
I didn't get to finish the game because I got stuck in different places a lot (maybe that's something you want to take a look at) and sadly the time I can dedicate to each indie game is limited, even to great ones like this, but I did love every single second, from discovering the mechanics, to the fun boss battles and the little bits of lore scattered around the mysterious and confusing landscape.
Keep the good work!