head to head
Psyvariar Delta 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
A bullet-grazing shoot-em-up about leveling by skimming enemy fire as closely as possible.
Half-Life 2 leans Execution (Pure Mechanics); Psyvariar Delta leans Execution (Pure Mechanics).
Psyvariar Delta leans clearly harder on execution.
Half-Life 2
Gravity gun and shooting demand precision.
Psyvariar Delta
Grazing bullets at the edge of death defines mastery
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Half-Life 2
Combine AI scripted, non-adaptive.
Psyvariar Delta
Enemy fire is scripted, not adaptive
Psyvariar Delta leans a little harder on variance, though the gap is small.
Half-Life 2
Almost no randomness.
Psyvariar Delta
Patterns are fixed and memorizable
Psyvariar Delta leans clearly harder on optimization.
Half-Life 2
Linear progression with no builds.
Psyvariar Delta
Buzz-chaining routes and leveling strategy reward planning
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.