One of my favorites! Celeste certainly isn't the easiest game, but everything from the level design, to the evolution of the gameplay mechanics, to the story and soundtrack, are all exquisitely designed. In fact, I revisit both the game and it's soundtrack often.

It's kind of amazing that it started off as a short game jam game on the Pico-8!!

Have you seen the new game being developed by the same team, Earthblade? It looks just as charming!