---- Number 1 ----
Add a travel guy, this is makes it easier to travel in the game instead of using breathings or just spamming your q and w key all the time.
Make use of your yen, for eg: Pay 500 yen to a traveller guy, tell him where you want to go and he can carry you or something and you get tped to where you want to go.
---- Number 2 ----
Obanai sword gamepass, please make the sword stretchy like love breathing. I feel like it will look better since it is for serpent breathing.
When you summon a snake for skill 1, let the sword stretch and then spawn the snake to throw poison at your opponent.
---- Number 3 ----
Make your project management better, by this I mean stop starting new updates and ending it half way to work on another one.
Look what happened at stone breathing, it got stopped half way and the development of DSPRG3 started.
---- Number 4 ----
Add more cosmetics and haoris, right now we only have Tanjiro's & Zenitsu haoris and it is very pricey.
Add more haoris including rengoku's, obanai, gyoemi, giyus etc and make them cheap like 50k or something.
---- Number 5 ----
Plan to add more demon arts in the game, eg: Daki, Gyataro, Douma, Enmu etc.
Along that, release stone breathing since I've already seen some skills are in development.
---- Number 6 ----
Add swordsmith village in the game or Haganezuka. This is because when people beat final selection instead of going to some NPC that is not even in show/manga (no offense nate)
You can add an animated NPC of Haganezuka making a sword or something and the dialouge could be like 'Hm, you beat final selection? Very well, break this sword and I'll break your bones..treat it with upmost care'.
---- Number 7 ----
Add more landmarks in the game, I know some people might disagree with this but having more landmarks can make the game more interesting.
Instead of having 3 towns and 1 farm, add more shops, hospitals etc.