Since Perseverance Rover is landing in Mars today? Why not make a space-based game? Avoid the Red sheet of lava on each side(because then players can just go on the side and cheat) use the right and left arrow keys to move, and avoid the comets. The comets get faster every time, and every time they touch the bottom of the screen, you get an extra point! Try to beat the world record!
Made in like an hour and 30 minutes. All credit goes to me.