Sure! Here's an example of a simple Iron Man game implemented as a single HTML file:
In this game, pressing the 'A' key activates the Iron Man suit, and when activated, you can fly around using the arrow keys. The game canvas is represented by a red square for the character and an Iron Man suit pictogram when activated.
Note that in this example, you need to provide the image file "emozi_himawari.png" which is used as the Iron Man suit pictogram. Also, for simplicity, collision detection, scoring, and advanced game mechanics are not implemented, but you can further enhance the game according to your requirements.