Sure! Here's a simple Pew Pew game implemented as a single HTML file using JavaScript and enclosed in script tags. It can be played on a smartphone. Please note that this is a basic implementation and can be expanded upon for more features and customization.
To play the game, simply open the HTML file on your smartphone browser, and you'll see a game board with a yellow circle representing the player (pew pew). Move your finger horizontally on the screen to control the player's position. Red obstacles will appear from the top and move towards the bottom. Avoid colliding with the obstacles, and try to survive as long as possible. Your score will increase by 1 each time an obstacle reaches the bottom. If you collide with an obstacle, the game will end and you'll see an alert with your final score.