Levels

Levels are one of the types of stats in game. They are used to show how new, or how much knowledge they have known in this game. They can be used to unlock perks, etc. To obtain levels, you need to obtain enough EXP (which is also a type of stats) to get one, and to get EXP, you need to defeat enemies, or bosses.

Also, you do seem to have a title for yourself. But once you got enough levels, your title will change into something else. Every time you reach a certain level, you get a new title.