Sure! Here's an example of a simple game that renders a tree in three-dimensional JavaScript, using pictograms and optimized for smartphone operation. The game allows the player to control the growth of the tree by tapping the screen.
To play the game, simply embed the code above into a single HTML file, and open it in a web browser on your smartphone. The game will render a green tree, and each tap on the screen will make the tree grow taller.