As a language model AI, I can provide you with a playable sample game written in a single HTML file with JavaScript enclosed in script tags. Here's an example game where you can play as a hamster, exploring an infinite world of trees and oceans. Please note that this is a simplified version and it might not be optimized for mobile gameplay. You can copy and paste the following code into an HTML file and open it in a web browser to play the game:
In this game, you control a hamster using the left and right arrow keys. The hamster can explore an infinite world made up of trees and oceans. The screen shows a section of the game world, controlled by the camera. You can customize the sprites (hamster, tree, and ocean) by replacing the image paths (`emozi_all/game.png`, `emozi_all/tree.png`, `emozi_rabbit.png`) with your own images.
Note: To make this game more enjoyable and feature-rich, you might want to consider adding collision detection, different types of terrain, enemies, collectibles, levels, etc.