Immersive Sim:

>Immersive
everything has a purpose for existing in-universe and some sort of interactivity for the player
>Simulation
the first-person perspective

pic related, the first Immersive Simulation (System Shock) explaining what it means.
Having multiple solutions for everything is not an immersive sim....

Also known as: FPS with mission objectives.
Goldeneye is an immersive sim.

>>715924223
the ending screens and level select menus make it just an FPS

"ImSim" means "Deus Ex inspired"

>>715924545
/thread
It's a better name than Metroidvania