head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

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

Execution · Pure Mechanics
A one-tap reflex test of threading a bouncing ball through rotating gaps.
Half-Life 2 leans Execution (Pure Mechanics); Helix Jump leans Execution (Pure Mechanics).
Helix Jump leans a little harder on execution, though the gap is small.
Half-Life 2
Gravity gun and shooting demand precision.
Helix Jump
Perfect tap timing through gaps is the entire game
Half-Life 2 leans a little harder on reads, though the gap is small.
Half-Life 2
Combine AI scripted, non-adaptive.
Helix Jump
No opponent of any kind
Helix Jump leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
Helix Jump
Tower layouts vary slightly but patterns repeat quickly
Half-Life 2 leans a little harder on optimization, though the gap is small.
Half-Life 2
Linear progression with no builds.
Helix Jump
Almost nothing to plan beyond keeping the ball falling
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.