Sure! Here's a simple game named "Battle of the Mechs" implemented as a single HTML file, using JavaScript enclosed in script tags. It can be played on a smartphone and features two mechs shooting lasers at each other using pictograms:
Please note that the code provided is a basic implementation to get you started. You will need to replace the `emozi_bear.png` and `emozi_chicken.png` with your own pictograms representing the mechs. Also, ensure that you have the appropriate images available and adjust their sizes accordingly. Feel free to modify and enhance the game as per your requirements.