Sure! Here's a sample implementation of the game you described using JavaScript enclosed in script tags in a single HTML file. I used some pictograms for the creatures. You can run the code in any browser to play the game:
In this game, you can tap on the "Spawn Menu" to select and spawn different creatures. The "A90" creature attacks a random creature when clicking on it and does a huge amount of damage. The "Human" creature simply moves around, and the "Rush" creature moves towards a random creature and kills it on collision. The game simulates the interaction between these creatures.