head to head
Geometry Wars 3: Dimensions asks more than Half-Life 2, and the gap is execution.

Execution · Pure Mechanics
A twin-stick arcade shooter where relentless swarm pressure demands perfect movement and targeting at escalating pace.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Geometry Wars 3: Dimensions leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Geometry Wars 3: Dimensions leans clearly harder on execution.
Geometry Wars 3: Dimensions
Weaving geometric enemy swarms at extreme speed is the ceiling
Half-Life 2
Gravity gun and shooting demand precision.
Half-Life 2 leans a little harder on reads, though the gap is small.
Geometry Wars 3: Dimensions
No opponent; all enemy behaviour is scripted swarm logic
Half-Life 2
Combine AI scripted, non-adaptive.
Geometry Wars 3: Dimensions leans clearly harder on variance.
Geometry Wars 3: Dimensions
Enemy spawn positions vary run-to-run, adding chaos
Half-Life 2
Almost no randomness.
Geometry Wars 3: Dimensions leans clearly harder on optimization.
Geometry Wars 3: Dimensions
Drone type selection and geom farming locations are learnable
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.