Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript and enclosed in script tags. This game is inspired by Geometry Dash and can be played on a smartphone.
In this game, you control a red square, similar to the player in Geometry Dash, by tapping or pressing the up arrow key to jump. The objective is to avoid hitting the ground. The game runs in a loop, updating the player's position and redrawing the canvas every 20 milliseconds.