head to head
Puyo Puyo Fever 2 asks more than Dead Space (2008), and the gap is reads.

Execution · Practiced Mastery
Strategic dismemberment under resource pressure, solved by upgrade planning and practiced limb-aiming.

Execution · Practiced Mastery
A competitive falling-blob puzzle testing fast chaining under speed pressure.
Dead Space (2008) leans Execution (Practiced Mastery); Puyo Puyo Fever 2 leans Execution (Practiced Mastery).
Puyo Puyo Fever 2 leans a little harder on execution, though the gap is small.
Dead Space (2008)
Precise limb-targeting under Necromorph pressure is the core skill
Puyo Puyo Fever 2
Fast chaining under accelerating speed is the lead axis
Puyo Puyo Fever 2 leans clearly harder on reads.
Dead Space (2008)
Necromorphs follow fixed approach patterns, not player modelling
Puyo Puyo Fever 2
Versus human play adds light prediction of attacks
Puyo Puyo Fever 2 leans a little harder on variance, though the gap is small.
Dead Space (2008)
Store stock is deterministic; minor drop variance on kills
Puyo Puyo Fever 2
Piece colors random but quickly mapped
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Space (2008)
Weapon upgrading, power-node routing and stasis timing are optimisable
Puyo Puyo Fever 2
Chain patterns have known optimal building techniques
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.