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

Execution · Pure Mechanics
A bullet-hell shooter testing precision dodging through dense scripted patterns.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Bullet Heaven 2 leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Bullet Heaven 2 leans clearly harder on execution.
Bullet Heaven 2
Dodging dense bullet patterns is the whole game
Half-Life 2
Gravity gun and shooting demand precision.
Half-Life 2 leans a little harder on reads, though the gap is small.
Bullet Heaven 2
Bosses fire scripted patterns, not adaptive
Half-Life 2
Combine AI scripted, non-adaptive.
Bullet Heaven 2 leans a little harder on variance, though the gap is small.
Bullet Heaven 2
Item drops add minor randomness
Half-Life 2
Almost no randomness.
Bullet Heaven 2 leans clearly harder on optimization.
Bullet Heaven 2
Character and weapon choice optimize survival underneath
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.