Its alright. Randomized stages were pretty cool, the ability to jump over the supposed height of the screen was also nice. I also was a big fan of the colorful graphics. I was able to reach the end of the demo, I'm not sure what happened but the boss just froze in place and let me beat him down. Its still a work in progress of course, though a bit short.
My main issue was with the shop items. It seems weird the main character is a knight, and the powerups feel like they could belong to any kind of hero, really. Where's a freaking shield, for one? Where's a trusty steed to move faster? A shitty squire to absorb damage for you? The Master's sword thing and bombs are nice, but thats just throwbacks to another game entirely. BTW The explosion for the bomb powerup is superlame.