Celeste64 conserve a lot of game design they used on Celeste but on a 3D environment, making it a really enjoyable experience but not everything is flawless, the camera control is really basic obstructing the movement, if you have played Mario Odyssey you will recognize the importance of features like a button to recentre the camera to player, a lerp smooth motion on the camera, etc. This game as a N64 version is really great but we are not on a N64 and they can improve some little things like I said.
It's a really great short experience, there is a lot of charm with the retro visuals and as a free game is easy to overlook these issues.
Very recommended. :)