Okay so I really like this game it has so much potential to be something amazing, This is the type of game you could easily sell for $15 when it has a lot more too it.
Some concerns no one girl route right now has anything amazing to it, like its good but it just suddenly stops. I feel you should focus to do one girls route and get that finished so people have a taste of how each route is going to be with each girl (Doesn't have to be Mia if your wanting her to have the most effort put into her route, can be a side one but people just need a taste to want the whole thing if that makes sense).
The detective stuff is really cool but can be confusing which results in people coming to here to find information or go to the discord to find out how to do things. Maybe add hint stuff into it (Maybe a button to switch on highlighted mode where it colours stuff if your missing clues/items with that person location), I was fine for me because I've played a lot of stuff like this but to bring in new players to get hooked to this type of game it could make things really confusing for them and make them just not play it in future.
Not sure if its a bug but I cannot repeat scenes with anyone like Catharine, I go to her place at night and I get the 3 icons appear but when I click them its just a blank screen with no prompt to do anything afterwards. So it could be a bug or it could just not be implemented yet if its not implemented yet then its cool but otherwise I thought I should make this known at least if it could be a bug.
Text/phoning should probably let you use these functions at any time instead of just waiting for them, if they ever have key points in story it would be nice being able to read back through the texts and stuff.
I also think in this type of thing a gallery is needed instead of having to replay the game to experience the scene again. Maybe I've just missed a gallery option? but like that bartender part was unexpected and it was great because of being unexpected but only got to experience it once. Though maybe your working towards more with her in future.
Overall I think this game has soooo much potential to be the most popular h-game out there. Not even kidding, I have spent the last week trying out a chunk of them just because I felt like giving these games a go again and this one stands out the most just because of how many different things are available or will be available to do and how its not the normal generic improve your relationship and then bang them game. I like that you have cases you need to solve, while having a main quest and then having side quest to other girls. Gives the game a whole lot of things you can do in the future its just right now each thing we only get to dip our toes into each part.
I kind of hope this blows up to the point your able to recruit others to help you make progress a lot quicker. It feels like that there is sooooo much more to come and we only have a small fraction of what's to be in this game. I wish I could support with money myself but I cannot afford to do so.