Sure! Here's a simple game where the objective is to avoid stepping on the floor as it turns into lava. The game can be played on a smartphone and uses pictograms for the visuals. Just save the following code as an HTML file and open it in any web browser.
In this game, the player starts at the bottom of the screen. The floor gradually rises, and the player needs to avoid touching it by jumping. There are three pits where the floor turns into lava represented by different pictograms. If the player fails to jump in time and touches the rising floor, the game ends.