Erth.io is a really interesting RPG game. You can choose different classes such as archer, magician, and warrior. Each of that classes have advanced classes. Also, you can improve your additional abilities like jump, speed, and dash.
You can try different combinations of skills and classes to find the best for you. Collect yellow gems, kill the monster and kill other players, all of that give you XP. Enjoy the game and play with friends.