Really nice music and sound ambience. I liked the exploration aspect and the subtle hints as well.
In my first playthrough I wandered far in one direction and then I decided to restart the game since I was too far to move back :) Maybe a slight indication that I am going too far away would be good. Maybe just darkening the screen and a little trick to stop moving the player when going too far in the game world (while still animating the sprite) would keep the player close to the playing area.
Also props for the chosen approach to the ending :)
Technical: in Firefox (at least in version 44) the visuals (pixels) are blurry due to the wrong scaling method picked by the browser, I guess, since it works fine in Chrome.