Use the arrow keys or the WASD keys to move. Avoid spikes and lava. Purple bounce pads make you jump higher.
Thanks to @nosettopic for the original project: https://scratch.mit.edu/projects/1011600715 Thanks to @griffpatch for the Scratch Cat costumes: https://scratch.mit.edu/projects/112494410/ I added many more levels and features, including wall-jumping and bounce pads. I removed the ice and water features, because they seem unusual to have in a platformer.