Sure! Here's an example of a simple game implemented as a single HTML file that meets your requirements. The game involves counting up numbers in a box, where each number is multiplied by a factor that increases by 2% with every click. You can play it on a smartphone and pictograms are used to enhance the visual experience.
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In this game, there is a box represented by the `<div>` element with the id "box". Inside the box, there is a text element represented by the `<span>` element with the id "count". The initial count is set to 0 and a factor of 1.02 is used to increase the count by multiplying it with the factor.
The game starts by adding 1 to the count and updating the display. Clicking on the box will trigger the handleClick function, which calls the updateCount function to multiply the count by the factor and updates the display accordingly. With each click, the count increases by 2% faster through multiplication.
Note: The game starts automatically as soon as the HTML file is loaded in a browser.