Thank you so much for such a detailed answer! I'll probably ask someone I know to proofread the text next time to fix the issues you pointed out. I was worried the text was completely bad, but it looks like it wasn't.
I checked the code again and realized the untranslated strings were a Renpai error. I'll try to fix that in the future.
I'm glad you liked the game. I'll play your novel; it's already on my list!