So I took one look at this game and immediately said "No." I didn't like the art style. I like detailed sprite artwork and I detest large blobs of monotone color. The gameplay seemed fine. It's a platformer and I have played those before so missing out wasn't a problem. The difficulty is fine for me on normal so far, but there are various assists that can be used if they are wanted or needed. No lives, if you fail you are immediately put back at the safe zone and you can try again.
Then I watched the Game Grumps Let's Play and discovered the plot.
The game's protagonist is Madeline. She is a determined (or stubborn?) plucky? redhead dealing with anxiety and just wanting to know she has the capacity to do and overcome and for this reason she is going to climb to the top of the titular mountain, Celeste. It is a strange mountain. Such a plot is catnip to my psyche! No way but up, my friends!
It's very good. You learn all the character's mechanics right from the start and each screen is the challenge. You figure out the right path and then execute. With instant reset on death, experimentation is the order of the day. Each level has quirks which it quickly teaches. There are bonuses and harder extra levels one can unlock. The characters are quirky, but it all feels solid. You can even skip cutscenes or, after talking to someone, you can go back and enter conversation again to hear more until everything is said.