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Hey there! Quick questions out of curiosity: what engine do you use to create 3D games like these and do you use a different engine for 2D games? And what programs are involved in creating the 3D art and animation? Thanks in advance! :)

just from playing their games, the 3D games like this one start with the Unity splash screen and the 2D games start with the Gamemaker splash screen. So Unity and Gamemaker Studio.  As for 3D art and animation I don't know what tools they use, but I can recommend Blender https://www.blender.org/.

Thanks! :)