Just finished it. And I have to say. I really enjoyed it. I did have low expectations with this initially but it really drew me in and became a really great experience, the usage of tons of obscure words that had me googling them constantly was quite fun as well as tons of nice fun details that I was able to make out because I am learning Japanese such as say Loui wearing ぺったん T-shirt. The art is quite great once you get used to it though I would say that potentially using less patterns on clothing might help though I digress.
I really enjoyed the characters after I warmed up to them. I am also excited to see where they go from here and I would wish for some more comedic moments with them.
I also really enjoyed the ending as holy shit I felt it coming but I did not expect it.
There were some errors that I noticed mainly misspelling possibility as "posibility" and then according to my friends. This line having rough grammar.
"experience blind to it" (experience it blindly again) and "once more time". (remove time as once more works)
I would also really like it if a list of terminologies with explanations could be added as a quickly accessible menu as I felt that sometimes I can be overloaded with terms like say Aeroseven and I cannot quite recall who they are and so being able to who they are will help greatly. I think of this in terms of like Umineko where it was a press of a button to see all the characters and if they're alive or not.
And one last thing would be that during novel mode, It can be hard at least for me to realise who is saying what line which can be confusing and require a retake to get who said the line. Either by using colour coded names or by adding names in novel mode.
But overall, I am excited to see what you and your team will pull off with arc 2. I have high hopes :)
Have a nice day and be proud of what you made.