Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript:
Tap Game
Tap anywhere to level up!
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To play the game, simply open the HTML file in a web browser, and tapping anywhere on the screen will cause the player's level to increase and their appearance to change accordingly. When you reach level 15, an alert will pop up notifying you that you're now a "Warrior Square", and when you reach level 50, another alert will congratulate you for becoming a "Strong Square". The player's appearance is represented using pictograms as requested.