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These kinda games are called hypercasual and very popular on mobile. For implementation part I suggest you to learn mesh deformation ,mesh merge and mesh creating , shortly learn how to manage meshes.
yes it is but as a developer it is good to know meshes. You may check this tutorial series https://www.youtube.com/watch?v=ucuOVL7c5Hw at least you get the idea behind it
i think it's too hard it's like to modeling by code without blender ,
ok thank you very much