I know that just about every game unlocks something, but does anyone know what beating each game gives you? I'm only interested in unlocking the two bonus games right now which is why I'm asking. Thanks!
Im not sure how to unlock the second bonus game. But I think spewer unlocked A.V.G.M for me. Aether unlocks some of Edmunds drawings a child. Tri Achnid. unlocks a Lonely Hermet comic. Time F unlocks another comic. And Coil unlocks random drawings and illustrations. Havent beaten Meat Boy or Grey Matter yet.
Really? For me, Aether unlocked "The Box" of childhood drawings, since Aether is inspired by Ed's childhood. Time F unlocked "The Chest" (see: The Binding of Isaac's absolutely final level) with random recent drawings. Coil unlocked AVGM, the light switch game, and both were experimental.
I haven't beaten the others, but since Spewer is longer than Triachnid, Spewer should unlock the second unlockable game.