TagPro is probably the simplest most competitive game in the world. It is easy to play but hard to master. You can spend infinite hours on this game. There are veteran players who played for a very long time. The only thing this game lacks is a big playerbase.
A straight 10/10 game. TagPro is one of my all time favorite games. It's pretty much as competitive as CS:GO. I love that you can use different skins for the appearance of TagPro. You can even create your own maps and skins. Very underrated game.