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To create a running game with two characters that can be played using a smartphone, I recommend using HTML5 and JavaScript. Here is a sample code that you can use:
This code creates a canvas element and draws two characters on it: a red character and a blue character. When the spacebar is pressed, both characters move to the right. The first character to reach the goal (the right edge of the canvas) wins the game.
You can customize the code to suit your needs by changing the speed, size, and color of the characters, as well as adding more functionality such as sound effects and animations.
I hope this helps you create a fun and entertaining game!