Sure! Here's a simple text-based game implemented in a single HTML file using JavaScript, enclosed in script tags:
Animal Escape Game
In this game, you need to set all six animals free before they escape by pressing the corresponding keys on your keyboard. The symbols for each animal are displayed on the game board. Once all animals have escaped, the game ends and you win.
Please note that this is a simplified text-based game, and it may not work perfectly on a smartphone due to the absence of keyboard events. However, it can be tested and played on a desktop browser.