In Celeste, you play as Madeline, a budding mountain climber who aims for the peak. Throughout the story, the game touches on various themes and topics that aren't typically seen in platformers, such as self-doubt and mental health, yet they meld together with the gameplay in such a way that I believe provides an elevated experience to the player.
That is to say, there is a heavy emphasis on personal growth present throughout; if you think you can do something, you can: the game challenges you to think not in "ifs", but "whens".