Super Great precision platformer, death isn't extremely penalizing though it can get very frustrating. I recommend playing this on a controller with a D-Pad as I had a lot of frustration with the joystick occasionally going diagonally when I felt like it shouldn't have and since there's no threshold settings I couldn't adjust to my liking.
Outside of my personal frustration Celeste is really good and I highly recommend playing it if you are a fan of difficult but beatable platformers.