Nice game, but the map design is a bit weird, I don't really know where to go.
Also, regarding your sound/music problem, I suggest that you try to find some free music and sounds online to help spice up your game, a soundless game is very jarring, and will affect your audio score. You don't HAVE to make the music/sounds all on your own. Just make sure to credit the original artist! (duh!)
Also, there seems to be a bug, when you enter into full screen mode, the buttons will disappear for some reason? o.0 Maybe try messing with the canvas settings.