Here's a description of the gameplay:

At the main menu you are given a quest that you will have to complete at the Arena. You may choose your looks and the boosters you will take with you. When you enter the Arena you have to survive fights with other challengers who complete their own tasks.

The PvP strength of the fighter is defined by the number of points the fighter has. If an opponent has lesser points then they are defeated with a single strike and all of their points go to the attacker (io-game style).

You can gather points by harvesting resources on the arena and completing secondary quests.

When you complete your main quest, you can escape the Arena to get the reward, rank up and start again.