Sure! Here's an example of a simple "Whack a Melon" game implemented as a single HTML file using JavaScript. This game assumes smartphone operation and uses pictograms:
In this game, a melon image is displayed on the screen and the player's objective is to tap on the melon as quickly as possible. Every time the melon is tapped, its position is randomized within the game area. The player can keep whacking the melon as long as they want.
Please note that you would need to replace `'emozi_all/melon.png'` with the actual path or URL to your melon image in order for the game to display the melon pictogram correctly.