I really enjoyed playing your game, and the story, it was more challenging than i expected but fun nether the less. I especially liked having to press the opposite key, that is an awesome idea and like that there is hit points for enemies and yourself.
I found it hard to know when to block, I think maybe it should be a different key like spacebar which could prevent you inputting the arrows to attack when held down. The arrows spoken were not the clearest but did sound fun. Clearing a level is very satisfying. Can't fault it!