Basically the ball will follow your mouse and that square guy can jump on it. This is a template for platformer games with an extra twist. If you want just a normal platforming game then go inside the project and do what the notes say.
The code for the purple square isn't perfect, so I would recommend that you try and optimize it to your liking.If you do make a game, put it in Baby Tulin Fan Club is I can play it and give HONEST feedback https://scratch.mit.edu/studios/52001852
