Sure! Here's a simple implementation of a game inspired by Geometry Dash using JavaScript enclosed in script tags in a single HTML file:
You can copy and paste this code into a single HTML file and open it in a web browser (preferably on a smartphone) to play the game. The game involves controlling a red box (player) by tapping the screen to jump over green boxes (obstacles) moving from right to left. If the player collides with an obstacle, the game ends and an alert message is displayed.