Sure! Here's a simple game implemented as a single HTML file using JavaScript, enclosed in script tags:
This game is played on a smartphone and represents increasing water levels. The display uses pictograms, with a water icon ("🌊") representing the water level and a plus icon ("➕") indicating an increase in water. The game starts automatically and increases the water level by one every second. If the water level reaches the maximum level (10 in this example), the game is over, and an alert is displayed.