head to head
Blades of Steel asks more than Half-Life 2, and the gap is reads.

Execution · Pure Mechanics
Arcade hockey reflexes with light shot-angle guessing against human opponents.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Blades of Steel leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Blades of Steel leans a little harder on execution, though the gap is small.
Blades of Steel
Skating, passing and shot timing decide every rush
Half-Life 2
Gravity gun and shooting demand precision.
Blades of Steel leans clearly harder on reads.
Blades of Steel
Versus a human, goalie duels become guessing games
Half-Life 2
Combine AI scripted, non-adaptive.
Blades of Steel leans a little harder on variance, though the gap is small.
Blades of Steel
Fights and bounces add small arcade chaos
Half-Life 2
Almost no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Blades of Steel
Angle exploits on the goalie are quickly mapped
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.