I'll try out your demo. I'll write comments as I play through the game:
-Auto-dash would be nice.
-I found Potions in a chest, but in my inventory they're called Water?
-I can walk over all the objects in the forest map.
-I can walk over some objects in the office building.
-Why do all these enemies inflict blind with auto-attack? That's so obnoxious...
-The end of the 2nd forest dungeon looks like a dead end.
-I run faster than a car!
-No idea where to leave this city other than the way I came in.
Not really sure what to say of it. There wasn't anything that stood out as terribly bad, but on the other hand, there's a lot of things lacking or in need of some good polishing. The mapping itself looked OK in general, but you need to update passibility for a lot of the objects, as I was able to walk over at least 50% of random stuff on the maps.
The story/setting doesn't seem very fleshed out from what I've seen. I got the idea my character was locked inside some place, but not really sure why. Near the end of what I played I think I understand my character is a demon...? But what makes him a demon, he looks and acts like a human being to me? Why are demons kept alive in the first place, why aren't they just being killed? Why does everyone use primitive weaponry (swords, spears, staves) when the technology in the world is advanced enough to have cars in it? Why are my characters able to leave the blockade by simply having a pass? Does this mean that there are demons of higher status that have these passes, and aren't actually imprisoned? Then what makes them different from the ones who are imprisoned, why are people OK with them being free to go wherever they want?
The combat honestly wasn't very exciting. At least I did get 1 skill, but it was nothing more than "do more damage", and there's no way to manage my MP other than drinking a potion. I levelled up some, and never unlocked a 2nd skill. The enemies did nothing interesting either, but they do hit fairly hard. Not sure why you felt the need to give enemies in the 2nd forest the ability to inflict blind on auto-attacks. It makes battles unnecessarily tedious, and there's no way to reliably get rid of blind, except for buying overpriced potions in the shop (I was able to buy only 1 of them, which is useless when I get blinded by auto-attacks). But yeah, the combat could do with a major overhaul. Make skills do more than simply "do more damage", and introduce more skills in the early levels. Enemies need to somehow be more interesting. Tune them around the effects of your character's skills and abilities (or the other way around), so you can give the player strategic options.
Anyway, I think the game has potential as long as you keep on working on it.