Sure! Here's a simple game implemented as a single HTML file using JavaScript and enclosed in script tags. The game is about a child who is trying to collect flowers and other gifts to give to a villager before leaving, but encounters obstacles from someone who doesn't want them to leave. The game can be played on a smartphone and uses pictograms for visuals.
In this game, the player (represented by a blue rectangle) can move around the village using the arrow keys. The objective is to collect all the flowers (yellow rectangles) while avoiding the obstacles (red rectangles). If the player collides with an obstacle, the game is over, and if all the flowers are collected, the player wins the game.