Pretty good
I love the atmosphere of this, even if is a demo. Sure, the music does get repetetive, but it was a good choice (if only the clip was a little longer) and there were plenty of typos... but those were already pointed out. I didn't notice anyone mentioning the bug with the magic orb usage though: When choosing attacks before a battle begins, you'll notice that your orb pool decreases accordingly when switching to a higher level skill. However, if you change your mind and switch back, the orb count does not return to its original value. Fix this. Also, once in awhile, after selecting a level 2 skill for the first action you cannot change the other actions to level 2. I couldn't reproduce this consistently, so I can't pinpoint where the problem is.
Work on it and finish it up and you'll have yourself a great game!