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The commercial release of Celeste is a new game, written from scratch, implemented in C# (XNA/FNA/MonoGame). It includes a port of the original. I'm kind of curious if they actually wrote a PICO-8 emulator for that or just ported it to C#.

They have a Github repo with some of the source code up (mostly just stuff to do with character movement and control).

https://github.com/noelfb/celeste

Apparently it's based on this framework:

https://bitbucket.org/MattThorson/monocle-engine/src/default...

They ported the PICO-8 version line by line to C#. Since there aren't that many lines, apparently it wasn't that hard.

There is an SDL port for the Switch but it's under NDA and you need to request access for it [1].

[1] https://twitter.com/icculus/status/981730137736712192

There's an SDL port, but it can't be publicly distributed due to NDAs.