i've finished the game and to give my honest thoughts:
-it's a nice idea but the execution could have been so much better
-what grinds my gears the most is that instead of sss they could and should have used literally any of her orisongs as a main theme (especially considering they used orisongs for the other gamers members)
-some of the throws are pretty much impossible to hit out of the park
-there are koronesuki in the crowd but for some reason not everybody is koronesuki
for what is supposed to be a korone fangame it's surprisingly (not in a good way) lacking of korone and korone-related stuff
difficulty-wise it's not TOO hard but the final boss can get quite frustrating as he uses all the tricks in the book and you never know what type of throw will it be so you need to be prepared for anything
surprisingly only took me just below 3 hours total to beat it and knowing she played the winnie the pooh flash game all those years ago i don't think she'll struggle too much
on a side note, when i watched koyori streaming this game i saw these "golden balls" worth two home runs but in my playthrough not once did i come across them