Sure! Here's an example of a simple game similar to Adopt Me on Roblox, implemented as a single HTML file with JavaScript. It uses pictograms to represent different pets, and the player starts with owning every pet.
Welcome to MyPet Game!
Click on any pet to interact with it:
Please note that this is a simple example and may not provide all the functionalities of the game "Adopt Me" on Roblox. The game logic and additional features can be added and customized based on your requirements.