head to head
Time Surfer 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 endless runner where players slow and speed time to dodge obstacles.
Half-Life 2 leans Execution (Pure Mechanics); Time Surfer leans Execution (Pure Mechanics).
Time Surfer leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Time Surfer
precise timing-based reflex dodging
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Time Surfer
no opponent, solo endless runner
Time Surfer leans clearly harder on variance.
Half-Life 2
Almost no randomness.
Time Surfer
procedurally generated obstacle patterns
Half-Life 2 leans a little harder on optimization, though the gap is small.
Half-Life 2
Linear progression with no builds.
Time Surfer
minimal strategic depth beyond reflexes
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.