Very fun game, I could honestly see this being developed further into a longer game with multiple "worlds" and maybe even the minions spawning in to help or spawning things to help you for the run (like a bomb or a temporary click speed increase).
If you can I would advise putting the music sound player in a "Global" scene so that it doesn't stop playing when the run ends, or at least it would allow you to fade it out/switch to another song during the screen change. As well as maybe adding a random "pitch" to the hit sound to make it slightly less repetitive.