Good idea, technically this would be easy, but visually it would take a lot of time to draw the sprites
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the engine I'm working doesn't have advanced interation with 3d models like shapeKeys. I would have to write such a complex system from scratch myself. Moreover, shapekeys are most often used for true visual 3d, not for flat rectangles with pixel textures - otherwise, the character models would look too crude. Therefore, I only see the traditional option, even though it's more difficult.