head to head
Fotonica asks more than Half-Life 2, and the gap is execution.

Execution · Pure Mechanics
A first-person runner testing reflexive timing at extreme speed.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Fotonica leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Fotonica leans clearly harder on execution.
Fotonica
One-button timing at extreme speed defines everything
Half-Life 2
Gravity gun and shooting demand precision.
Half-Life 2 leans a little harder on reads, though the gap is small.
Fotonica
Solo runner, no opponent to predict
Half-Life 2
Combine AI scripted, non-adaptive.
Fotonica leans a little harder on variance, though the gap is small.
Fotonica
Tracks are fixed once learned, little randomness
Half-Life 2
Almost no randomness.
Fotonica leans a little harder on optimization, though the gap is small.
Fotonica
Memorizing track geometry plans optimal lines
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.