Really funny idea!
I had a couple problems though: One of them is that its a little long without any checkpoints. Its also pretty hard. Another thing is that the car window background might work better if it was held steadier or the car was not as fast because it was kind of jarring and gave me a headache. Last things I prefer games that use the theme mechanically not thematically but that's just personal preference. I also found one area to the far right of the play space where the monsters cant hit you at all.
Other than those few minor problems its great! I can totally see as a real game, if you kept it how it is I could be a cool mobile endless runner or if you added some more bosses and stuff like that it could be like Cuphead!