Sure! Here's an example of a simple game implemented as a single HTML file, containing JavaScript code enclosed in script tags. Please note that this is a very basic game and not comparable to the complexity of Minecraft. It uses pictograms to represent items and can be played on a smartphone.
In this game, you control a player represented by a blue square inside a canvas. Various items, represented by green squares, are scattered around the canvas. You can move the player using the arrow keys on your smartphone. Whenever the player's position overlaps with an item, an alert message pops up notifying you about the collected item.
Please note that this is a very basic implementation and can be expanded upon to create a more complex game with additional features and items.