Use the arrow keys to play. You might need to double or triple click the green flag because it sometimes takes a few clicks to generate the platforms. Basically, jump onto platforms to continue going, and jump onto springs to be bounced really high! Known bugs: 1. When using springs, platforms sometimes don't generate. 2. You lose when falling onto a low platform.
I learned how to make this from my scratch teacher a while back! I improved some things such as the game over and the score somewhat.