I just discovered you and have been playing this game for a while. I want you to have many great ideas and I think your games have much potential to be successful. There aren't that many Western porn games that focus on story and mystery unlike Japanese eroge so to see something with an interesting style and aesthetic among the generic sea of h games is amazing. However, I think there are things you need to improve upon first.
1. MUSIC: The OST isn't bad however the appropriate usage of it on events and locations is questionable. For example, there are many scenes where calm music should be playing but instead have more energetic drums that do not fit the situation. And it can be a bit repetitive hearing the same track repeatedly in the same area. Try using different music for each area to give it more life. I don't know if you're composing your tracks or not but in case you are and you don't want to keep making your tracks don't be afraid to use non-copyright tracks. I have played many great RPG games that use non-copyright music and they still feel natural and great.
2. GAMEPLAY: A lot of the gameplay feels grindy and unnecessary. It's hard to explain but for example the library. To complete many of the quests you have to go to the library all over again back and forth between maps to complete the quest. This is problematic since it feels less like we're solving a puzzle and more like a back-and-forth. Here's a common situation: During the robbery quest we are required to go to the library to find out how to complete the quest. Once we get the bat the player does the normal thing and goes to the store to complete the quest. Then it turns out you need to go to the library again to complete the quest and turn on the event. This isn't just for the library as well. Some situations kind of feel like a hassle to get through and I think it's better to keep things simple.
3. GAME OVER: When you get a game over you are forced to back to the title screen again. This might be fine if the game-over scenarios were rare but on my first date, I was forced to boot up the title screen 10 times. Not only that but players can be softlocked if they make the wrong choice forcing them to go back which can be very annoying. Make sure that losing is the least annoying as possible for the player.
4. WRITING: While not the best it is certainly very unique and quirky. Just try to rewrite and polish as much as possible to make sure the dialogue is natural and engaging. Remember not to drag on the dialogue too long or make things too obvious (show don't tell). I have also noticed there are many grammatical errors although that's nothing a bit of polish can fix. Try using a grammar-checking site like Grammarly or Wordtune.
5. Nitpicks: Most RPG games use another key for the menu like Esc, M, and especially X. So I don't know why you put it as 0. My keyboard doesn't have a numpad so this might apply just to me but it's best to keep the keys simple and accessible. Also, some of the transitions were kind of slow although that might be just for me.
I am sorry if this review seems a bit confusing since I am not good with English nor at reviewing (not to mention this was your first project so you probably already improved lots) but in summary I think that with a bit of polish and studying you could really make something that explodes. Try marketing yourself more often on sites like Newgrounds or YouTube and try to reach out to the target audience you want to appeal to with your games. Anyway, thanks for reading my shitty review and good luck!