Sure! Here's a simple game implemented as a single HTML file using JavaScript and enclosed in script tags. The game will be playable on smartphones and will feature pictograms.
In this game, the player (represented by a blue square) can be moved by dragging on the smartphone's screen. The enemy (represented by a red square) is initially located at a fixed position. Whenever the player gets within a certain distance threshold to the enemy, an alert is displayed indicating an "Alternate attack." You can add your custom logic for the alternate attack inside the `checkDistance` function.
Note that this is just a basic implementation, and you can modify it further to suit your needs, such as adding additional levels, power-ups, or more complex game mechanics.