head to head
Let Them Come asks more than Super Mario World, and the gap is variance.

Execution · Pure Mechanics
A fast-paced shoot-em-up testing aim and reload management against enemy waves.

Execution · Pure Mechanics
Precise jump execution across fixed levels with secrets to memorise.
Let Them Come leans Execution (Pure Mechanics); Super Mario World leans Execution (Pure Mechanics).
Let Them Come leans a little harder on execution, though the gap is small.
Let Them Come
Twitch aiming and reload timing dominate survival
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.
Let Them Come
Enemy waves are scripted, not adaptive
Super Mario World
Scripted Koopas adapt to nothing
Let Them Come leans clearly harder on variance.
Let Them Come
Wave composition and spawns vary somewhat
Super Mario World
Levels are fixed; nothing hidden survives one playthrough
Let Them Come leans a little harder on optimization, though the gap is small.
Let Them Come
Weapon upgrades and resource choices extend 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.