For the good ending, I was hoping we'd get a final image of the culprit's consequences... I was a bit confused on unlocking the other gallery images though, is it more than just losing via a particular stat as quickly as possible?
I will draw a picture of The Icon of Glut later down the line, and that'll be added to the gallery. And the gallery only unlocks if you beat the good ending, nothing else gets added if you achieve the other endings. If you unlocked the gallery, that's all there is inside of it.