Thank you very much for playing through and for your comment! As Kou's creator, I'm so happy you appreciate him as a character! I hope you look forward to his route too! We're also so happy you love our character designs! I also think Dai's gap tooth is unique and cute~
Regarding the "go back" option, I've added it to the quick menu on the textbox! It will be present in the Extended Demo! I'll also consider adding a "history" or "log" screen too!
We're so glad you're excited for the full game too! We can't wait to share it~