Sure, I understand the requirements. Here's an example of a simple game implemented as a single HTML file with JavaScript:
Welcome to Banban's Garden!
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In this game, you can tap on the screen to water the plants in Banban's garden. Each tap will make a new plant grow. However, you have to wait for 2 seconds before watering again. The garden display is updated to show the number of plants you have.
Please note that due to the limitations of the text-based interface, the interactivity and visual elements of the game may be limited. However, this example demonstrates a simple game that can be played on a mobile device using JavaScript.