This demo looks awesome.
The art and music are great, I like the nostalgic vibe of it.
The combat looks smooth, though I, personally, would add a small arrow above the character/enemy you are selecting, because it is hard to see at times which one is currently selected.
The boss was reasonably challenging and managed to kill me a couple of times, so I had to employ some strategy to win - which is a good thing.
The demo left me intrigued and wanting to play more.
Good job! Keep it up!
I recorded my playthrough in case it would be of any use to you.