Fun! Took me a minute to realize I had to restart the engine when it sputtered out, but I quite enjoyed it. Why anyone would put those giant rocks in their backyard is beyond me, though, I only managed to get 2 stars.
This isn't a problem specific to your game, it's pretty much every Unity game, but I use an ultrawide display on my computer and unity just zooms in to fit the width, so forcing full screen means I don't see the top and bottom sections of the screen and I couldn't see some of the UI.