* glfw, SDL - C, low level, require more work to get started with (maybe coupled with bgfx if you don’t want to write your own renderer).

* SFML (C++), Ebitengine (Go), bevy (Rust) - high level, easier to use.

* LÖVE2D (Lua), raylib (C) - even higher level.

And Dear ImGui is a must for implementing debug UI/level editor/tools. And maybe PICO-8 as an alternative (it’s something in-between of a low-level framework and a game engine)

I imagine he is thinking of things like SDL, SFML, Macroquad and so on.

Unfortunately, not really. I don't actually have a ton of experience with gamedev outside of engines, I just know what the failings of engines are from using them for a few projects over the years. The one library I might've recommended is a Rust one that's now defunct.