Interesting game. Wished there were more mechanics and different type of enemies. I think it was too grindy too, and Im not a fan of grinding games. Anyway, Started killing the yellow ones at 9 untill I was level 15, and then the pinky ones at 20 I think. And killed the king at 32.
I liked it, the fact that I would get one hit killed by any enemy added a kind of thrill to it :D