It's designed for 2D but there are libraries which add 3D rendering, e.g. Menori (
https://github.com/rozenmad/Menori) and G3D (
https://github.com/groverburger/g3d)
Alternatively, the LÖVR framework - https://lovr.org/ - is heavily inspired by LÖVE, but is aimed towards making VR games (but can also be used as a regular 3D game engine)