Sure, here's a simplified version of the game "Flabby Bird" implemented as a single HTML file using JavaScript:
Please note that in this example, you'll need to replace the background image URL with the actual path to an image of a bird (`emozi_all/background.png`) to get the pictogram effect. Also keep in mind that the game mechanics and visual details are simplified for the purpose of this example. Feel free to modify and enhance it further based on your preferences and needs.