Cool idea! I might be missing something, but it appears that after scaling up the first platform, the second platform is not able to be focused so that it can be scaled down. The "focus" keeps locking onto the first platform.
"F" button should allow you to switch between platforms that are close to player. Focusable platforms have an ancor point in the middle. If that appears you can press "F" a few times to select the right platform. Thanks for the feedback 🙏🏻
