Sure, here's an example of a game implemented as a single HTML file using JavaScript and incorporating various game mechanics such as movement, inventory, actions, animations, etc.:
This is a basic template for a game where you can control a player's movement using arrow keys. It also includes functionality for toggling the inventory and map visibility, although the actual implementation for displaying those elements would need to be added. The game container is a black box, and the player is a white square that moves according to the arrow key inputs.
You can further build upon this template by adding animations, game logic, additional features, etc. as per your requirements.