Cool game, both the music tracks sounded good.
Few suggestions from my side:
Try replacing the road picture with a straight path having no curves, as this would sell the illusion of you driving.
Try animating the player and looping the background.
Be careful when dealing with AI generated art as it would hinder the game from attaining perfection. You could have just used paint to trace a flat road surface, duplicate the image and flip it to create an illusion of driving. (You can't become good at something without trying) This would have even saved you those 10 hrs.
But overall its a fun game. Congrats.
PS: I couldn't find any link to the theme in my 10 mins gameplay.