Sure, here's an example implementation of the game described:
This HTML file creates a game canvas where creatures can be spawned using the provided spawn menu. The creatures can be clicked, and a specific creature ("a90") is able to attack and destroy other creatures on the screen. The "rush" creature moves towards a target and destroys it on collision, while the "ambush" creature moves randomly.
Note: This is just a simple demonstration of the game mechanics and not a fully-fledged game. More features and enhancements can be added based on specific requirements.