Hi Clavik!
Thank you very much for your detailed comments and thoughts. That was very interesting to read!
Your theory with the four temperaments is really original. I haven't thought about it like this, but indeed it fits to some extend. I think the characters will all gain more depth when you finish the game. I used more "stereotypical" characters than in TLS because I wanted the game to start a bit faster. In TLS the character introduction takes quite some time. (Ben is only introduced in Chapter 4!) I had the feeling that more impatient players stop playing the game because of that. That's why I wanted to "jump" into the action this time. For that purpose it's easier when players meet familiar character types they can understand faster. Later on more complexity is added, e.g., we learn why Marie is so shy, we learn about Peril Patti, we learn about the death of Sylvia's mother and the surprising backstory of Azuki (well, maybe less of a surprise if you had played TLS before...). I think at the end of the game you will feel that the characters have gained a lot of uniqueness.
For physics, i really didn't come up with good "educational" tasks, but the player gets involved into the project with Patti and will have to do some jobs (mini-games) for that, so I think, overall, it'll be a funny arc, and learning about physics happens in class, but only during the first days. (By the way: I guess without the science content I would have a few players more, but I don't have to make money with the game, so I'm okay with this as long as there are enough players who learn something new about the world through my games...)
Regarding Go: I am a Go player by myself (not too strong, just good kyu level) and I love it when more people play this beautiful game. That is the motivation to insert Go content into my games. And since I like science as well, I also inserted some of it into "Sweet Science". :)
Regarding the bugs that you've found: That was very valuable, and I have corrected most of them immediately. They should be fixed in the next update. The cat videos I will leave in, as it's not clear whether the player is just talking about how he thinks the future of internet videos will be. (And because it's funny, I think. ;)
Finally, just for curiosity and since you managed the translation issue, may I ask what is your native language?
Thanks again very much and all the best!