head to head
Super C 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
Tests twitch run-and-gun execution over memorised one-hit-death enemy patterns.
Half-Life 2 leans Execution (Pure Mechanics); Super C leans Execution (Pure Mechanics).
Super C leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Super C
One-hit deaths demand precise dodging and aim throughout
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Super C
Enemy waves 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.
Super C
Spawns are deterministic once learned
Super C leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
Super C
Memorising spawn patterns and weapon routes solves runs
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.