Sure! Here's a simple tower defense game implemented as a single HTML file using JavaScript. The game is playable on smartphones and uses pictograms for visual representation:
This code sets up a basic tower defense game where enemies move down the canvas and towers can be placed to attack them. The game loop continually updates the game state and redraws the canvas. It includes a simple implementation of the `Enemy` and `Tower` classes, and creates initial instances of enemies and towers.
Please note that this is a basic implementation and there's much more you can add to make it a complete tower defense game with different enemy types, tower upgrades, and more.