Click the green flag multiple times. Click Play. Use the mouse to control your rocket's Y position. Avoid fireballs, which make you lose a life. Collect pluses (+) which gets you more lives. When you run out of lives, you die.
Some art made on flaticon.com by Pixel Budha. Some art made on flaticon.com by Freepik. All code 100% me. I used a tutorial to help me, which was made by @DISHDASH88, on his youtube channel.