Hello Chris I been following the course ...I found one problem with the backgrounds images ....when you play the game ...the images get blurry and you can telling what is going on with the background(how to fix it)
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It could be that the images are set up with compression or filter on. These are the settings I am using for the BG images.
The changes I specifically make over the unity defaults ~ Filter Mode: Point(No Filter), Max Size 4096, Compression: None, and Pixels Per Unit 16 (this is just so one grid square = one square on the tileset). I also took the scale of the backgrounds and put it to 4 on X & Y to make it large compared to the game stage.