The same controls work in both 2D and 3D (WASD or arrows and jump), its just that your viewing angle is different (which makes some things easier to find).
To be honest I was just having some fun making it and the 2D mode is meant to be different to the normal 2D platformer style.
The GameDev.tv Game Jam 2023 - Free Course For All Submissions! » Entries » [2023/Jam] Chris the Cube - GDTV