Sure! Here's an example of a simple game inspired by Geometry Dash, implemented as a single HTML file with JavaScript enclosed in script tags:
This HTML file creates a simple game where the player (a red square) tries to avoid green obstacles moving from right to left. The player can make the square jump by pressing the spacebar or the up arrow key. The score is displayed at the top left corner of the screen, and the game over condition is triggered when the player collides with an obstacle.