I've to say I really love this game! I like the tiny pixel look of the game which has a kind of charm to it and the minimalistic combat system is interesting too. I agree with most people that it is too easy and I'd like to add that it would be more fun to have more "growth" of your character, e.g. new abilities, weapons. The last level was also rather confusing for me. The lava is a little hard to distinguish from the red floor tiles. I'm also wondering if some areas are actually possible to access.
I would love to play (and even pay for) a fully working game with sound and maybe a story and a further developed combat system. Great work on this one!