Sure, here's an example of a simple game implemented as a single HTML file using JavaScript:
This game initializes a canvas element, sets the initial positions for the player and target, and then updates the positions every 10 milliseconds to move the player towards the target. The player and target are represented using pictograms (👨 and 🎯). The game is enclosed in script tags and can be used as a standalone HTML file. Once the HTML file is opened in a web browser, the game will start and the player can play by watching the player pictogram move towards the target pictogram.