Collberg is very skilled forward. Doesn't shy away from the high-traffic areas and knows where to go to score goals. Initiates contact with defensemen and has excellent one-on-one moves. Posesses an elite wristshot, which he can release in a hurry with great accuracy and velocity.
Needs to add more bulk to withstand the physical game at the men's level. Lacks ideal frame and defensive play needs improvement.
Collberg made his Elitserien debut on December 7, 2010. He played on a line with Victor Backman and Johan Sundström in Frölunda's 2-1 OT win in Södertälje. Collberg registered 3:14 of ice time and became the tenth youngest player to parttake in an Elitserien game.