head to head
Touhou Rei'iden: The Highly Responsive to Prayers 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
An arcade hybrid testing precise orb control and dodging under scripted bullet pressure.
Half-Life 2 leans Execution (Pure Mechanics); Touhou Rei'iden: The Highly Responsive to Prayers leans Execution (Pure Mechanics).
Touhou Rei'iden: The Highly Responsive to Prayers leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Touhou Rei'iden: The Highly Responsive to Prayers
Controlling the orb while dodging dense fire demands precise inputs
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Touhou Rei'iden: The Highly Responsive to Prayers
Bosses and cards are scripted, not adaptive
Touhou Rei'iden: The Highly Responsive to Prayers leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
Touhou Rei'iden: The Highly Responsive to Prayers
Orb physics bounce unpredictably moment to moment
Touhou Rei'iden: The Highly Responsive to Prayers leans a little harder on optimization, though the gap is small.
Half-Life 2
Linear progression with no builds.
Touhou Rei'iden: The Highly Responsive to Prayers
Learning stage layouts and boss patterns helps but hands decide
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.