Sure! Here's a template for a simple 2D side scrolling beat 'em up game with rappers, implemented as a single HTML file using JavaScript. It uses pictograms to represent the characters. You can further customize and enhance the game based on your requirements.
To play the game, copy the above code into a new HTML file and open it in your smartphone's web browser. You'll see a canvas with a rapper representation for the player and enemies. The player moves based on touch or mouse movements (vertical only in this template). You can further modify and expand the game mechanics and graphics to make it into a finished game.