Sure, here's an example of implementing a basic SpongeBob fighter game using JavaScript and HTML within a single HTML file:
SpongeBob Fighter
In the above code, we have a simple game canvas where the player can control the position of SpongeBob by touching/moving on the screen. SpongeBob is represented by a pictogram image which you'll need to replace with an actual image path. The game continuously redraws SpongeBob at his updated position based on the touch coordinates.
Please note that you'll need to replace "emozi_himawari.png" with the correct image file path for the SpongeBob image. Additionally, you can further enhance the game by adding game mechanics, enemies, scoring system, and more.