Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript and enclosed in script tags. This game is designed for smartphone operation and uses pictograms. It has multiple game modes.
This game allows you to play as a character who can jump by either continuously moving or tapping the screen. The player is represented by a red square pictogram. The game has two game modes - 'moving' and 'tap' - which can be switched by commenting/uncommenting the respective `changeGameMode` calls. In the 'moving' mode, the player moves continuously, and in the 'tap' mode, the player jumps when you tap the screen.