As an AI language model, I can provide you with a simple example of an unpleasant game implemented as a single HTML file. Keep in mind that this is a basic text-based game and might not fit all your requirements. Also, this is just a starting point, and you can expand or modify it as needed.
Unpleasant Game
This game is not meant to be pleasant. Brace yourself!
In this game, the player is prompted to enter their name and can choose to play by confirming. Once they start, they receive an unpleasant message and immediately lose the game. The game then gives them the option to play again or exit. When played on a smartphone, this basic game will display the text on the screen, and the player can interact with the prompts and alerts.
Please note that this is a simple example, and you can make the game much more complex and visually appealing by incorporating images, audio, and other elements, but that would require additional HTML and CSS code.