Hey there! Thank you for your submission. As a fellow VN dev, I feel a personal attachment to this one!
With positives, I think you did a good job with using basic Ren'Py code to create a cohesive, living environment with characters changing expressions, bouncing, and reacting. A little goes a long way in this sense, and it felt like BA!
The plot was also pretty fun to follow! Low stakes though it may be, for something like a GDD game being played in real time, it works well. The character interactions are also pretty fun and generally accurate to how they canonically are.
As for my criticisms, I will say that you could have cut out some unnecessary dialogue that pads the script out, especially with scenes like Yuuka talking to herself about her affections for Sensei, a lot of Midori and Momoi's arguments, and even some of Yuzu's fears about the twins being dead. It gets a little repetitive after a while if you're just repeating the same idea - i.e. "I love Sensei."
Aesthetics-wise, I would have lowered the characters down a little more to mimic the BA style, putting each sprite's default position at about thigh-level. It might just be what I'm used to in VNs though.
Great work in total! I can't wait to see more of your projects in the future!