But before that; What is Celeste?
Celeste is an indie game platformer released in 2018. In tell the inspiring story of a young mountain climber named Madeline that managed to overcome her mental illnesses. However this game is especially well known for it's gameplay complexity. It is very easy to pick up, only having three distinct movement option. A jump, a grab and a dash. That if combined could create some of the biggest movement pool a platformer could ever dream.
https://www.lp.zone/t/just-breathe-you-can-do-this-lets-climb-celeste/2861