I do quite like the idea of this game mechanically! I feel like there should be a way to know when the sheep spawn, something like an indicator or clearer spawn points - otherwise you might be on the other side of the room and have no idea if there's a sheep coming for the painting while you're killing the rest.

Managed to survive for 2 minutes :)

Funny game, and a nice submission. I didn't quite understand why these evil sheep wanted to destroy the painting. Is there history behind that? Had a little laugh. Nice work.