This is so good! I like how you characterize everyone and how the protag is getting a character arc and being more confident! And the bonus content is really cool! It's nice seeing how things changed in the process of making the game side by side with the memes lol.
Volume 6 spoilers:
I was just replaying volume 6 before moving onto the new stuff, and I just realized that Tyzias says Emespi's name in the call! Nice forshadowing! Also the music in the scuttlebuggy! There are so many neat details in this VN!