head to head
The Gunstringer 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 Kinect rail-shooter testing gesture aiming against scripted enemies.
Half-Life 2 leans Execution (Pure Mechanics); The Gunstringer leans Execution (Pure Mechanics).
The Gunstringer leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
The Gunstringer
Kinect gesture aiming and dodging is the core skill
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Combine AI scripted, non-adaptive.
The Gunstringer
Enemies are scripted, not adaptive
The Gunstringer leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
The Gunstringer
Encounters are largely fixed
The Gunstringer leans a little harder on optimization, though the gap is small.
Half-Life 2
Linear progression with no builds.
The Gunstringer
Learning encounter sequences boosts scores
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.