Not a bad little game so far, it could definitely have done with updates graphics. Even simple things like player sprites and proper tilesets used in the dungeons. It would definitely have given much more of an immersion factor to the game.
I'm not entirely sold on the rhythm based battle gameplay. It's something I haven't seen before which is nice, but it got old relatively quickly. It doesn't make grinding to help get through the factory very fun. I'm still grinding to work my way through the dungeon, it's highly frustrating to lose and end up back on the world map. I'm going to keep playing and see how far I can get because it's a game that you've clearly put a lot of work into and I want to make sure that I give it a fair shot.
You've absolutely got a good core of a game here, but I see it as just that. A core. Make a few gameplay modifications, scale the difficulty down a little and add nicer graphics and you've potentially got a very good RPG.