Idle Champions is just what the name implies, an idle game. You pick a level and your characters will simply walk and fight monsters and collect gold. You can use that gold to recruit and upgrade your heroes so they do more damage. This will let you kill stronger monsters to collect more gold. This sounds like an odd choice for a console game sine with multiple screens on a PC you can let it play while you work or so other stuff and simply do stuff when needed, and I don’t doubt that is what people do.
The game does allow the player to attack with the Circle button. The faster you hit it the more damage you can do. This isn’t why the game is interesting tho. What makes the game somewhat interesting is the fact that where you position your heroes matters. Some give bonuses to everyone in a row, another has a higher attack if nobody is standing in front of him. These are just two of many examples.
At the end of the day, however, this is still a free idle game. Progress at times will screech to almost a halt if you aren’t willing to drop a few bucks. You can eventually get passed it since the game will continue to collect money while you are gone but it can take awhile. The game is fun in an odd way, but only for some people. It is, however, free, so it truly is no risk. Best wishes and may the gaming gods bring you glory.