Camera behavior is a very important thing in platformer games. Never make it just to follow the character all the times.
In this short video I described several ways of how camera could behave in metroidvania games and presented how it works in Fearmonium:
Fearmonium is a psychedelic action-platformer where suspense intertwines with humor. Start the game as the usual unpleasant memory and, reincarnate into a real phobia by breaking through the most hidden corners of consciousness of Max.