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

Execution · Pure Mechanics
A twin-stick arcade shooter about surviving neon geometric enemy swarms for high score.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Geometry Wars 3: Dimensions Evolved leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Geometry Wars 3: Dimensions Evolved leans clearly harder on execution.
Geometry Wars 3: Dimensions Evolved
Twin-stick precision dodging and shooting under chaos.
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 Evolved
No opponent modeling the player.
Half-Life 2
Combine AI scripted, non-adaptive.
Geometry Wars 3: Dimensions Evolved leans clearly harder on variance.
Geometry Wars 3: Dimensions Evolved
Enemy spawn patterns have randomized elements.
Half-Life 2
Almost no randomness.
Geometry Wars 3: Dimensions Evolved leans a little harder on optimization, though the gap is small.
Geometry Wars 3: Dimensions Evolved
Scoring routes are learnable but execution dominates.
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.