very fun quick game. by the time i had gotten all eight upgrades i had become death, destroyer of pacman ghosts. the final ghost coming in was a bit of a jumpscare with how sudden it was, but overall it was quite manageable. i liked it.
Overall, not very hard? I think it'd be nice to have a bit more time between the last boss appearing and the boss firing bullets. The speed of the bullets is a bit fast but it's counteracted by the fact that the pattern itself isn't very complex (and the boss goes down quickly enough).
The clicking-a-lot thing isn't really all that bad, mostly because the game is decently short. It's paced well enough that it doesn't cramp up my hand to click that much for that long, but at the same time there's enough time between the golden ghosts appearing to not be too quick of an experience.