Sure! Here's an example of a simple racing game implemented in a single HTML file with JavaScript. It uses pictograms for the game elements and can be played on a smartphone:
In this game, you control a car using the left and right arrow keys (or tapping on the respective sides on a smartphone). The car moves horizontally on a road represented by a gray box. The objective of the game is to avoid going out of bounds by keeping the car within the road boundaries. You can use different pictograms to represent the car and road elements by replacing the "emozi_all/game.png" file path with the desired image file.