head to head
Jamestown: Legend of the Lost Colony 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
Co-op bullet-hell shooter set in a 17th-century British colonial Mars.
Half-Life 2 leans Execution (Pure Mechanics); Jamestown: Legend of the Lost Colony leans Execution (Pure Mechanics).
Jamestown: Legend of the Lost Colony leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Jamestown: Legend of the Lost Colony
Bullet-dodging precision at high difficulty
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Jamestown: Legend of the Lost Colony
Bullet patterns are fully scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Almost no randomness.
Jamestown: Legend of the Lost Colony
Deterministic waves every run
Jamestown: Legend of the Lost Colony leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
Jamestown: Legend of the Lost Colony
Vaunt-chaining score systems and route memorization
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.