From my point of view a game engine by itself is basic code as long as it's not made towards a specific game. For example, from what I know the Minecraft engine wouldn't count as it has the built-in world loading and block rendering stuff, but if you were to write a 3D engine with basic mesh rendering, shading and physics if would.
Viewing post in A little confusion with the FAQ
It's not targeted towards a specific game/mechanic. It has window creation, model loading/organization, builtin (as well as the option to make custom) shaders, deferred rendering options, post-processing stuff, etc... It's really just an advanced rendering system with super simple AABB and OBB physics (not that great 😅). Still though, I'd really like to put it to use. Mostly to see what I need to change for it to flow better. Thanks!
EDIT: To clarify, I'd need to program all mechanics from scratch besides movement.