itch.io

I want two game worlds. a 3d world and a 2d world. when the character moves 5 ft in the 3d world I want the character to be moving that same 5ft in the 2d world. I want the player to be able to freely choose between the 2d world and the 3d world.  Would coding a game like that be extremely advanced for a new programmer like myself or would the solution be as simple as having the 2d world float physically above the 3d world and having a button to change your camera view thus changing  which world the players are playing in?

As a new game developer I know I'm filled with a lot of big ideas so before I go spending hours trying to brute force myself an answer, is trying to code a game that would be playing a 3d and 2d version of a game a huge coding task? I understand logically I'm now essentially making two versions of the same game but would the transfer from a 3d version to 2d version be as simple as having the 2d game world happening above the 3d game world and just changing cameras and adding the basic code ideas of "if camera is 2d use 2d inputs" and "if camera is 3d use 3d inputs"?