head to head
Raiden IV OverKill asks more than Super Mario World, and the gap is execution.

Execution · Pure Mechanics
A bullet-hell shmup testing reflex dodging of scripted enemy patterns.

Execution · Pure Mechanics
Precise jump execution across fixed levels with secrets to memorise.
Raiden IV OverKill leans Execution (Pure Mechanics); Super Mario World leans Execution (Pure Mechanics).
Raiden IV OverKill leans clearly harder on execution.
Raiden IV OverKill
Dodging dense bullet patterns demands precise reflexes
Super Mario World
Perfect inputs trivialise every jump, spin and cape flight
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Raiden IV OverKill
Enemies fire fixed scripted patterns, not adapting
Super Mario World
Scripted Koopas adapt to nothing
Raiden IV OverKill leans clearly harder on variance.
Raiden IV OverKill
Some spawn and item randomness, mostly mappable
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
Raiden IV OverKill leans clearly harder on optimization.
Raiden IV OverKill
Memorizing patterns and scoring routes maximizes runs
Super Mario World
Secret exits and route knowledge add a modest solvable layer
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.