Okay umm, I haven't played much of the game but I noticed some things. The characters. Some of them seems too cheerful that it kinda seems fake. It's like you're trying to convince the player that they are very flirtatious and dramatic. It felt like.. They're not a real person their personalities. I'm sorry I know it's just a simple project but I gotta be honest. That kind of super cheerful flirty thing, I've seen it too many times and I don't think it works anymore. At least for me. I value writing and characters. I'm not trying to say to be completely unique and otherworldly because they are slice-of-life stories that were really good.
Next, within seconds, without any real events that create a connection between the player and the characters, suddenly an emotional scene plays. If this is a short visual novel, then you could've given snippets of the player and character spending time together. Something like "After the moment with Flint at the part, he started paying more attention to you and you talk to him at the company whenever you had the chance. It has been a week after the event at the park. You were glad and happy that you get to know him." Or something to tell the players that they got closer during the time skip. It's just strange all of a sudden they're all chummy and flirting without even feeling that the time has passed and they spent time together. It threw me off that the MC and Flint suddenly have a blushing scene after the angry Flint scene. To me, that wasn't a strong enough emotional connection for them to like each other yet. It was just too soon in a short amount of time.
A person is more complicated than some few comforting scenes to suddenly get blushy. If they get more interested in each other and want to get to know them, I understand. But I don't think it's enough to straight out be like "You'd be upset if you didn't meet Flint flint whether it's fate or not." That feels weird. It's too soon to say things like that. If quite awhile did pass and they did spent time with each other, you didn't tell us.
They weren't enough events to even have a love connection. Well I haven't played the whole game but this is what I think. I'm not telling you to change the writing of the whole game or delete the game or anything. For future references when you make more games. And keep in mind of criticism from people also. When people always compliment you, you won't know what's wrong and so you can't do something about it. Good luck on your future games
Also forgive me for any mistakes I made.