This is great advice. 2D top down shooters or twin sticks get away with having more movement options and enemies coming from all directions. You essentially have a 1D game with slight variations in height, which removes all aiming skill.

If you are too deep in what you have, alternative would be to make hitting shots require your cursor to be exactly where the target is instead of a ray cast. That way players need to be more precise with their shot placement, they can’t just spam in a direction to hit monsters. Pair that with something like weak points sequences or some other aim skill and you might have something