Cool game man, I'm sorry I didn't realise you had games published to you itch page sooner.
The shooting is cool and I like the dancing zombie ; )
Since you asked for help in the description:
I'd make some sort of jumping/driving parcour for the car, maybe rings in the air for the plane. And you could try to make the NPCs fight back when you shoot them or shooting-ranges, etc any type of game/scenario that has rules&stackes&reward&punishment.
This way you would have gameplay, beyond a demo : )
You could also highscores.