Sure, here's an example of a simple game implemented as a single HTML file using JavaScript encased in script tags:
This simple game involves a player represented by the 👾 pictogram, enemies represented by 💣 pictograms, and a goal represented by a 🏆 pictogram. The player moves by swiping on the screen in the corresponding direction. The objective is to reach the goal while avoiding enemies. The player gains a point for reaching the goal and loses a point for colliding with an enemy. The current score is displayed on the screen. The game loop continuously redraws the elements and checks for collisions.