Sure! Here's an example of a simple game called "Red Shooter", where you control a red emoji warrior and tap the screen to shoot green emoji monsters. The game will be implemented as a single HTML file using JavaScript and enclosed in script tags. Please note that this is a basic implementation and can be further expanded and optimized if desired.
To play the game, open the HTML file in a web browser on your smartphone and tap the screen to shoot the green emoji monsters. The red emoji warrior (your player character) will automatically move towards the monsters. Your goal is to eliminate all the monsters by shooting projectiles at them. Good luck!