Use the arrow keys or mobile. Down to crouch or fall through a yellow platform. When under a yellow platform, jump, and you will be on top of it. Click on the black "Sound" bar to toggle sound. Find the star as fast as you can. Can you beat my time of 27 seconds?
I used a platformer physics tutorial from @griffpatch_tutor plus the music from Scratchnapped. I also added infinite scrolling! Win screen and star from @StratfordJames. Pausing from @dn_scrtch. Hint: The star is up top.