I agree - 100%. The game would vastly improve having a proofreader that speaks English (native).
To the Dev, here's a couple other suggestions:
-Many of the scenes with a lot of dialogue only gave one static image. For example: The initial meetup with Monica is long and has a lot of dialogue but only has one image. There are a few renders of that image with Monica changing expression but the rest is static. What I'm getting at is the scene lacks interest. Break it up with a few extra renders from different camera angles; to the right, left, closer, elevated... whatever breaks up the monotony. There are many scenes like this, this is just one example.
-The game feels a bit repetitive; MC wakes up, cleans up in the bath, has breakfast, meets LI, has sex, sleeps... and this continues daily for most of the current story. It's got a "Groundhog Day: feel to it. If a little variety could be thrown in that would help too.
-A kinetic novel is okay, but your audience would improve x10 is you could start including choices. I know it's a lot of work to have different branches but they don't have to be major splits, just some options/diversions would be enough
These are just my opinions based on my experiences. The suggestions above, and many others, are found in the top VN's and they're contributing factors to what makes them so good. Making changes early will help prevent you from falling into the REMAKE trap. One of the things that frustrates readers the most is having a developer halt progress and remake several chapters. Typically this happens because new developers learn as they go and end up wanting to change many things as they improve. Depending on the time it takes to complete the remake your readers will lose interest and patronage will suffer too.
Even if you ignore my suggestions, please keep an open mind to the suggestions of others. I want you to succeed, as well as many others... you've got a good thing going