Thank you for the feedback! I'm aware that it seems rushed and before release I did what I could to try to remedy it. I suppose I didn't fix everything, though. I will be updating the game at some point in attempt to address these.
Recent community posts
I was struggling with this as well but I finally figured it out. Apparently, you can get Satch's good ending regardless of whether you win or lose the tournament. For it to unlock in the scene picker, you have to win the tournament and get the good ending (I did this by maxing out my points and picking the choices that weren't bad, but weren't great either). After that, it gave me the completion bonus.
Hope this helped!