head to head
Slapshot: Rebound asks more than Half-Life 2, and the gap is reads.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.

Execution · Pure Mechanics
Physics hockey where manual stick control and outplaying humans decide everything.
Half-Life 2 leans Execution (Pure Mechanics); Slapshot: Rebound leans Execution (Pure Mechanics).
Slapshot: Rebound leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Slapshot: Rebound
Manual stick rotation makes every pass and shot a motor test
Slapshot: Rebound leans clearly harder on reads.
Half-Life 2
Combine AI scripted, non-adaptive.
Slapshot: Rebound
Human defenders force constant deking and anticipation
Slapshot: Rebound leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
Slapshot: Rebound
Pure physics, explicitly no RNG by design
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.
Slapshot: Rebound
Team positioning and rotations matter but stay simple
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.