@BlueWarlock Indeed the Star shows that you have levelled up. Change the screen with "Tab" and you will get to the Map/Level Up/Inventory screen.
By the way level up: After finishing all quests you will get no more experience points. So you cannot level up any more. Would be nice if you could level up even after the game has been finished - and perhaps you could even add some random quests after the plot has ended - then this game could be a "neverending" game - which would be great, as it is fun to play.