Sure! Here's an example of a platforming game implemented as a single HTML file with JavaScript. It uses pictograms to represent the platforms and updates the score by 1 every time the player touches a new platform:
Score: 0
In this game, the player (represented by a red square) can move by touching and dragging on the screen of a smartphone. The objective is to touch new platforms (represented by blue rectangles) to increase the score. The score is displayed at the top right corner of the screen. As the player moves upward, touching higher platforms, the score increases by 1 for each new platform touched.