head to head
VVVVVV 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 brutal minimalist platformer where flipping gravity replaces jumping.
Half-Life 2 leans Execution (Pure Mechanics); VVVVVV leans Execution (Pure Mechanics).
VVVVVV leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
VVVVVV
Pixel-perfect gravity flips through spike gauntlets
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
VVVVVV
No opponent
Half-Life 2 leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
VVVVVV
Every hazard is fixed and visible
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Linear progression with no builds.
VVVVVV
Routes are short and obvious; execution is everything
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.