Sure! Here's a simple tower defense game implemented as a single HTML file using JavaScript and enclosed in script tags. The game is designed for smartphone operation and uses pictograms for visuals.
Tower Defense Game
Note: This code is just a basic framework for a tower defense game and doesn't include all the features that a complete game would have (e.g., towers attacking enemies, enemies reaching a goal, wave management, etc.). You can further enhance and build upon this code to create a full-fledged tower defense game.