Sure! Here's an example of a battery charging animation game implemented as a single HTML file using JavaScript. The game is made to be played on a smartphone and uses pictograms for the battery charging animation:
In this game, you will see a simple battery charging animation represented by a rectangle with a charging level indicator and a charging icon symbol. The charging level increases gradually until it reaches 100%, at which point the charging icon becomes visible, and an alert is shown to indicate that the battery is fully charged.
Note: The charging icon in the code above (``) is a Unicode representation of a charging icon. This might not display correctly on some browsers, so you may need to add a CSS class or specify a different icon depending on the pictogram library you are using.