This is a 2-player pong game. The player on the left uses W, S, and D. The player on the right uses Up, Down, and Left arrow keys. There is a video for how to create this game here: https://youtu.be/DyYieuClgHA
If you hit the star, the ball speeds up for your opponent. If you press the D or left arrow, you can shoot your opponent and their paddle will disappear.