Sure, here's a simple text-based game that you can play as a finished game. As per your request, I will implement it as a single HTML file, enclosed in script tags, written in JavaScript, and designed for smartphone operation.
Staycation Game
In this game, you start with a staycation adventure where you choose your destination. You can select from different locations such as the beach, mountain, city, and forest. Once you choose a destination, it will display the location and a message to enjoy your stay. You can then click on the "Go Back Home" button to return to the starting point and choose a different destination. The game will continue until you decide to complete your staycation.