https://scratch.mit.edu/explore/projects/allLook inside for more customization options! You can remix it, or you can look inside, and click the 'file' tab at the top. Then, you can click 'save to your computer'. Then, you can make a new project, and do the same thing, except you click, 'load from your computer'. Also, this is a ENGINE! That means that it is a template for you to create your own project! That is why this is so short. If this is laggy, then use Turbowarp. Here is the link: https://turbowarp.org/487656614 (edited for the remix)
Added: Trampoline animation Press ''c'' to see the path of the cube(I removed the trail, because of that. Green is the right or left path, blue is the jump path and red is the crouch path. At the top right side of the level, you can see the last path bit.)