Sure! Here's an example of a simple space ship shooter game implemented as a single HTML file, using JavaScript and enclosed in script tags. The game will allow the player to control a space ship using a joystick-like control to move around and a gun icon to shoot at the attacking aliens in space. You can view and play the game on a smartphone.
Please note that this code provides the basic structure for a space ship shooter game and includes the implementation of the joystick-like control for movement and a gun icon. However, it does not include the complete functionality of a full-fledged game with attacking aliens or shooting capability. You can build upon this foundation to add more features and game mechanics to make it a fully functional game.