Sure! Here's a simple shooting game implemented as a single HTML file:
To play the game on your Android 5.0 device, you can save the code above as an HTML file (e.g., `game.html`) and open it using a web browser on your device. You can also host the HTML file on a web server and access it using the browser on your device.
The game allows you to control a player object (depicted by a blue circle) and shoot bullets (depicted by red circles) to destroy asteroids (depicted by black circles). Your score increases for each destroyed asteroid. The game ends if an asteroid collides with the player. The score is displayed on the top left corner of the screen.
Please note that this is a basic example and can be further enhanced with additional features, levels, graphics, etc.