From what I've played so far (I believe it's V1.2?)
the game should hardly be called a "game", more like a fapping material or sth like porn. because basically, MC has little to no significant psychological depth.
but still, judging from MC's figure and dressing styles, you can tell that Dev at least has a pair of discerning eyes for aesthetics. so it does have potential.
I have some advice for Dev.
a. if u want to dig deeper, u might want to focus on psychological descriptions, and try to learn how to build a real causal event tree, or in other words story outline.
b. but the truth is, people need to fap, people need porn. so actually u may consider ignoring psychological changes or what the correct game form is, as long as it could justify itself, changes in behavior and appearance are enough.
I played this game for free so, these are just advice, nothing more.
bedtime for me. good luck.