Sure! Here's a simple implementation of the game you described using JavaScript and HTML:
Omegamons Simulator 100
Collect omegamons and use them to beat levels.
You have 1 free omegamon. Different omegamons have different magical abilities.
This is a simple implementation where you can click on the Omegamon to attack and open the chest to summon new Omegamons. Each time you open the chest, a new Omegamon is added to the game interface. You can expand on this logic and add more features to make it a complete game.