I love the concept, and the presentation's really good too. The character designs were super interesting, and I love the sword throw animation. The font and pause menu had some weirdness with the text overflowing, however.
My issues were twofold, however. First being the implementation of the main mechanic. The hero keeps throwing his sword to areas that are really difficult to reach, but then keeps moving. Since he can't defeat all the enemies in his way you keep have to fight through tons of enemies when you go to return the sword, and even more if you have to go back and hit a switch. I'd recommend having him stop in place if he doesn't have the sword.
The second was that the jump controls were very slippery and annoying to play through. Being able to change velocity in mid-air is a crucial element of platforming games, and it's really annoying to be unable to, especially with the enemies knocking you around.
Other than that, the game was still pretty good, it just needs some polishing.