Sure, here's an example of a simple game where you play as a lion hunting and defeating other animals using JavaScript:
Lion Boss Game
In this game, you are a lion. To play, you need to click on one of the animal pictograms displayed on the game board. However, you cannot defeat another lion, so if you click on the lion pictogram, you receive an alert message telling you to try again. If you click on any other animal, you receive an alert message congratulating you for defeating that animal.
Please note that this is a simple example and doesn't include advanced gameplay or progression. It's meant as a starting point for you to build upon if you would like to expand the game further.