I like the controls, and I love the hero doesn't shoot anything. He's just too cool to shoot. :D (hmmm, the others reviews say he can shoot, but I've finish the game just jumping on the sheeps).
I think all the game is very well balanced, it's never repetitive, the respawn points are perfect, the graphics looks very good, I love the sheeps dying and the dialogues between Jack and his sensei are superb!
Maybe you could improve the animation of the character, specially when he climbs. But it gives the game a retro flavour, so it's ok for this one.
The end is great!