Hey, we used to play every arcade game with keyboard only. And weren't masochist.
Guess I'll have to try to Guacamelee! just to see if it's really that difficult to play, or if it's just an exaggeration of people who didn't start with games like Commander Keen, Dangerous Dave, Jill of the jungle, Titus the fox ... back in the middle age of pc gaming. :D
EDIT: Oh so Larian turned the beta into Release version for everyone. Nice. Maybe i'll even play it now.