head to head
Ghost Squad asks more than Half-Life 2, and the gap is execution.

Execution · Pure Mechanics
Pure point-and-shoot accuracy against memorisable scripted spawn patterns.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Ghost Squad leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Ghost Squad leans clearly harder on execution.
Ghost Squad
Light-gun accuracy under time pressure is the whole test
Half-Life 2
Gravity gun and shooting demand precision.
Half-Life 2 leans a little harder on reads, though the gap is small.
Ghost Squad
Terrorist spawns are scripted pop-up targets
Half-Life 2
Combine AI scripted, non-adaptive.
Ghost Squad leans a little harder on variance, though the gap is small.
Ghost Squad
Branching routes hide content until explored
Half-Life 2
Almost no randomness.
Ghost Squad leans a little harder on optimization, though the gap is small.
Ghost Squad
Memorising spawn patterns per route raises scores
Half-Life 2
Linear progression with no builds.
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.