Hello :)
You can add anything you want to the template, a boss fight for example, you can add it at the final stage of the level, and give him special abilities, you simply copy and paste the events in: Enemy mechanics → AI Actions → Attack → Damaging player.
And you will make the player take damage from the boss enemy from a specific mechanic.
Controllers are very easy to add, just install the gamepad extension, and then add its control conditions to the player movements events.