This game is super fun to play in free time!! It runs smoothly and the idea is cool. These aere some of my suggestions

1. you could add an idea dedicated to the reality part...maybe a secret bossfight where playable teto is corrupted or smh and you can fighther with shopkeeper teto.
-it would provide more usage for items like the puzzle piece and cat hand or effects like overide
-it could use your equipped skillset

2. Like the other comments, new enemies. If possible, maybe an gauntlet or team-fight or 2v1 like in the pokemon games.

3. Another obvious one, maybe more easter eggs. Its fun to find some, so maybe you could add a hole in the wall somewhere or in the reality area where you could walk a while and find another secret, maybe a drawing or another item idk

yipe ok bye

loved this game.my suggestion would be to give the game a proper ending.perhaps you can add another harder option to fight miku .if you can beat her here then the ending sequence will happen.

you could also add other fights.maybe a mode where you can't attack and only can survive and it could work as a high score system for how long you could survive.

perhaps a fight against an alternate teto who is hypnotized.where you can be sv teto.

well i love the game and it has a lot of potential but i would love it if you gave an ending to this game and make another new similiar one.

it could be a fighting game about fighting vocaloids and others perhaps.

well either way i loved your game and will play anything you publish next.

It would be neat if the "この先現実" area thing actually had somewhere to go, as to my knowledge, I don't think there's anything there. And like many others suggested, an expansion in the world with more enemies as well, as looking at all the equipment in the teto shop, there are equipment to deal with things like burn which from what I know you can't really get inflicted by, so it would be neat. 

I'd like to see more fights! (like groups of smaller enemies, or maybe fighting a different miku)

I specifically think it would be cool if they inflicted more debuffs (so items like Puzzle Piece are more useful than right now)

In general I think the base fighting system is superb, I want to see it in more and different situations so that every item and attack can be useful somewhere

It would be really cool if you explored that region of "reality", maybe a boss fight, or even enemies, since there are skills in the teto store that allow you to attack more than one enemy

would be cool if it had some easter eggs, even if they're silly things, but things like this works better when teh idea comes of the dev, so if ya had some cool ideias, don't hesitate to put it in bro

and talking about easter eggs, I would like to see an secret boss foght as well with all this barrier of reality stuff.

well, good luck making the updt, I'm looking foward to see it :)