Super cool, but I noticed a few problems. I found the combat to be pretty fun, but it's quite easy to get hit due to the way the "invincible enemy" thing works after you damage them. Instead of being able to juggle enemies in the air, they would just fall through my sword after I hit them once. The small enemies also took a bit to kill, which really slowed down the pace of the game, which I found detrimental. I also found pushing the boxes around to be a bit frustrating, as the physics didn't always play nice. Do I have to push the boxes with my sword? Wasn't intuitive to me. Finally, why were the boxes rendered at a 45 degree angle? That was weird to me, kind of perspective-destroying.
Despite those issues, however, I thought it was a really fun game. With a bit of tweaking and polish, you could definitely turn it into a great little game.