Turn on turbo mode to see operating system-like window dragging. (Leave it off to see a kinda cool trail animation lol) You can click the colored boxes within the window to change the color of the background. Press "f" to see FPS. Source: https://scratch.mit.edu/discuss/topic/18037/ Running the project at 60 fps on Turbowarp makes it look really nice.
I'm probably not the first person to do something like this, but I just thought it was cool, and I might use it in future projects.