I know this may seem a very small issue but I know the VN community is very large. This is purely feedback and not meant to be taken as criticism.
For story driven games like this one, it would lift it 1000% if you could get the script looked at and edited by a natural English speaking friend or volunteer. It wouldn't take much with each update to have the script re-done in normal speech. I play quite a few of these games but I end up just skipping dialog, and therefore story line, when the English is this bad. Please understand, I don't code and I don't make games so I know I may be told to shut up and accept things gratefully. This is just honest feedback that, I believe, would help many more people engage with your game.