Nice game! Really enjoyed the challenge of trying to lick my elbow. XD Also, the music was perfect for the can-do attitude type of mood for this situation. Only thing I would say needs adjusting is the GUI. When I fullscreen the browser, the image got smaller and doesn't fit the screen. Other than that, amazing game!
Haha I feel you there, especially when working with unity. The way I figure it out is check each screen sizes given by default for unity (Such as 10:4, 5:4, etc.) and set the Canvas to ScreenWithScreenSize(You should see an option like that). And it all comes down to fiddling with the resolution sizes and all. I know that may sound confusing to be honest, but thats how I ended up scaling the size just right for the browser and possibly any screen size XD