Damn it, I came SO close to winning! I'd taken out all the major enemies apart from the Golem and the Reaper, identified what was on every square and had 12 hit points.
In retrospect, I think you should probably give the player the ability to toggle difficulty levels in the full version. That isn't to say making the game very tough to beat is wrong if that's your vision. There are of course quite a few excellent games like that. But I think players who aren't so adept at strategy would likely appreciate a game mode where the ratio of enemies to loot is a bit more forgiving.
Beyond that, I still think it's an excellent game for a demo. I appreciated the secret re. the wizard and the master skeleton.