I've found Lua engines like Love to be great for prototypes and gamejams but when it comes to implementing a full game its not as good as the full blown engines like Unity/Godot.

If your game has more than trivial amount of UI, particle-systems, 3D, etc then it becomes very time consuming. To write and tweak a full blown responsive UI like in-game windows, alerts, animations etc with code-only is not trivial. With a full-featured editor like Unity and Godot, UI, particles, tweened-animations and such becomes much easier as you can keep interactively tweak things around until its perfect without the edit-code & recompile cycle.

There's also King's "Defold" engine which uses Lua and has a visual editor but the last time I used it over a year ago, I found there was almost no in-game UI libraries so although making the prototype was fun and relatively easy adding UI became difficult.

I've always thought Love looked good, but I've never tried it myself.

Do you only use it for quick prototyping of ideas and then move over to a different engine if you like the idea and want to expand?

I imagine the answer could come down to the scope of the game.

It is more for quick sketches that are interactive, or designing animation that would be too difficult in Blender or After Effects. While folks do make full blown games with it, for me it is more of a interactive animation workbench.