I've been learning this game because I'll be running it in Speedromizer III: https://horaro.org/speedromizer/srmz3 The QT and Museum routes are largely the same from ClassicRagu's run, but made some changes to the Kouen route to drive the time down a little bit. Notably I've modified the paths up most of the hills, and I've changed order for collecting the kids at the lake. A sub 13 minute Kouen seems possible.