head to head
Raiden IV OverKill asks more than Half-Life 2, and the gap is execution.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.

Execution · Pure Mechanics
A bullet-hell shmup testing reflex dodging of scripted enemy patterns.
Half-Life 2 leans Execution (Pure Mechanics); Raiden IV OverKill leans Execution (Pure Mechanics).
Raiden IV OverKill leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Raiden IV OverKill
Dodging dense bullet patterns demands precise reflexes
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Raiden IV OverKill
Enemies fire fixed scripted patterns, not adapting
Raiden IV OverKill leans clearly harder on variance.
Half-Life 2
Almost no randomness.
Raiden IV OverKill
Some spawn and item randomness, mostly mappable
Raiden IV OverKill leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
Raiden IV OverKill
Memorizing patterns and scoring routes maximizes runs
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.