Sure, here's a simple game that you can play on a smartphone. The game involves moving around and avoiding skeleton pictograms that try to kill you. The player is represented by a smiley face.
To play the game, copy the code below and save it as a single HTML file. Open the file in your browser on your smartphone to start the game.
Once you've created the HTML file and opened it on your smartphone, you'll see a yellow smiley face as the player character. Use the arrow keys to move the player around and avoid the white skeleton pictograms. If a collision occurs, an alert will appear indicating that the game is over, and you can reload the page to restart.
Have fun playing the game!