Sure! Here's an example of a simple game where you can control a character to avoid spikes using JavaScript and HTML. Please save the following code in a single HTML file, open it with a web browser, and play the game by clicking on the screen:
In this game, you'll see a blue box representing the character and a red spike. When you click anywhere on the screen, the box will jump. The spike moves across the screen from right to left, and if the box touches the spike, the game is over. You can restart the game by closing the alert dialog that appears when you lose.