Sure! Here's a simple game where you start as a fish and become a human by eating. The controls allow movement in four directions: up, down, left, and right. I will be using pictograms to represent the game elements.
This HTML file contains a canvas element where the game is rendered and JavaScript code enclosed in script tags. The game starts as a fish represented by an orange circle. The player can control the fish's movement using the arrow keys on a smartphone. As the fish eats and grows, it transforms into a human represented by a blue square when reaching a size of 100.
You can save this code to a file with the `.html` extension and open it in a web browser on your smartphone to play the game.