Developer of the game here! It's actually not cell shading. That usually has a threshold with the colors so that it looks more like a comic here. There's a few

Developer of the game here! It's actually not cell shading. That usually has a threshold with the colors so that it looks more like a comic here. There's a few things going on: edge detection, screen space gradient, and lack of textures. The lack of textures is what makes it feel like cell shading, but I'm not actually thresholding any of the colors.