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

Optimization · Practiced Mastery
Gentle adventure about painting living murals to revive a polluted town.

Optimization · Practiced Mastery
An easygoing co-op Kirby about recruiting enemies as friends and combining their elemental powers.
Concrete Genie leans Optimization (Practiced Mastery); Kirby Star Allies leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Concrete Genie
Light painting motions and gentle platforming
Kirby Star Allies
Very low difficulty, AI allies carry fights
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Concrete Genie
No adversary; bullies are scripted scenes
Kirby Star Allies
Friend AI helps rather than opposes
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Concrete Genie
Little hidden beyond exploration
Kirby Star Allies
Fixed layouts and bosses
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Concrete Genie
Finding paintable walls and puzzle solutions
Kirby Star Allies
Friend-ability element combos solve puzzles
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.