The player sticks to walls if you jump and then walk in the direction of the wall which feels odd. If you don't want this to happen you can create a physics material 2D with all values (friction, ect) set to 0 and then attach it to the collider 2D that you use for your player. This souldn't really affect anything else in your game only the sticking to walls part. Aside from that it's fun to play.