As an AI text-based model, I can provide you with the JavaScript code to create a simple Zookeeper game. You can then embed this code into an HTML file. Here's a playable sample game implemented in JavaScript:
Welcome to the Zookeeper Game!
Use your smartphone to play and help the zookeeper.
To play the game:
1. Create an HTML file and copy the above code into it (enclose the code within `script` tags).
2. Save the file with an `.html` extension (e.g., `zookeeper_game.html`).
3. Open the file on your smartphone using a web browser.
4. Tilt your smartphone to control the zookeeper and try to catch the animals (green squares).
Note: The game uses the `mousemove` event, which is not supported by all web browsers. Make sure to test it on a browser that supports this event (e.g., Chrome on Android).