Click the green flag to start, and use the arrow keys to avoid obstacles and eat cake!
I made a game like this in high school using JavaScript. That was a fair bit more complex, prompting users to answer review questions about French grammar when they hit obstacles, but this is still a fun, arguably more fun, game (probably due to the lack of French grammar questions). Very importantly, try to avoid the red convertible that Elon Musk (for some reason, nobody quite knows why) launched into space a few years ago. But do enjoy the cake. I went for simple on this prompt, as I didn't have much time to spare today. But I still think the project turned out nicely.