Oh it does stuff, but the game goes to a black screen right as soon as the title screen comes in, like it twirls in and before you get a full look at it the screen becomes black. And you can still play the game, SFX work, but no picture whatsoever. Not in windowed or fullscreen.
You could try the release here: https://github.com/theofficialgman/Celeste64/releases/tag/test4