head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Practiced Mastery
Light twin-stick dodging through scripted robot arenas.

Execution · Practiced Mastery
A cinematic action sequel through Viking-age Iceland.
Kitten Squad leans Execution (Practiced Mastery); Senua's Saga: Hellblade II leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Kitten Squad
Twin-stick dodging and aiming is the whole challenge
Senua's Saga: Hellblade II
Set-piece combat needs timing.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kitten Squad
Robot enemies follow simple scripts
Senua's Saga: Hellblade II
Encounters are scripted.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kitten Squad
Levels repeat identically between attempts
Senua's Saga: Hellblade II
Minimal randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Kitten Squad
Weapon picks and learned layouts give modest edges
Senua's Saga: Hellblade II
Linear progression, few systems.
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.