You should consider adding to the description of your game the gamepad controls. I was pretty confused at first, but after trying it with a controller everything worked :).
I really enjoyed the retro Gameboy look of your game :), the visuals and aesthetics are really good. The only thing missing are the sound effects, it could really add a lot to a game like this that is focused on the feeling of discovery.
I really liked your game and I had a lot of fun with the ending!