This was a good update on a classic flash game!
When I hit the wall and pop scare happened, it seemed to get stuck and I couldn't do anything other than close the game.
Otherwise, good job getting it done!
I also missed the back button. I still can't find it, so maybe it's a resolution error. Did you make it in Unity? Unity won't work on my current laptop, so I can't look up exactly what the settings are you need, but on the Canvas object there should be a parameter about resizing to fit the screen at alternate resolutions.