You're most welcome, it's too good a project to not comment on! Don't get me wrong (in case I sounded too critical), the fact it wasn't even meant to be an extensive, fully-fledged visual novel game with immense intricacies only makes this project infinitely more of an achievement with how much it was able to fit in such a short time.
I don't feel that would've been boring at all (depending on the execution, of course), but the game turned out really good as it is without additional content so it's nothing to stress or fret about. As for the art, there's always room for improvement and development, after all, you'll get to the level of expertise you desire as long as you put in the time and effort, you clearly already have the passion and necessary base of skill down since the art turned out great as well!
In case I didn't put too much clarification in my previous message, I'm willing to help, proofread the English, and playtest, all without any payment at all. Being able to contribute to any games or projects and test them before releasing them to the public and polish them more would be an honor even without any payment, it's already a payment in itself to be of help. Dividing the work would lessen workload and allow you to complete more goals and projects more efficiently and effectively too since many one-person teams end up overexerting themselves and forgetting they're only human and need rest too.
Don't get me wrong once more in case I was too critical in my previous comment, you've already done a great job on the translation and everything without any extra help, but I have a personal philosophy of "the more, the merrier" (as long as that "more" is of contribution and not destruction, evidenced by many large dev teams that end up disbanding because of dramas). Regardless of whether you are or aren't interested in my offer though, I wish you all the best with your projects and everything at all and I sense you'll be an even larger and immensely more prosperous maker one day, remember to always take care and never overwork yourself through these processes (too many forget to do so)! My offer's always up, and it wouldn't be in vain at all, getting to polish projects would be an honor! Thank you for all the work you put into this, I'm genuinely in love with the story, art and everything!