head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, and it is a single point.

Optimization · Practiced Mastery
A four-player Wii Kirby romp gathering ship parts for the stranded alien Magolor.

Execution · Light / Casual
Cheerful physics platformer about a kicking blob toppling a capitalist conspiracy.
Kirby's Return to Dream Land leans Optimization (Practiced Mastery); Pikuniku leans Execution (Light / Casual).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Return to Dream Land
Easygoing main game; EX mode adds modest demands
Pikuniku
Floppy kicks and hops, gently imprecise
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Return to Dream Land
Bosses are pattern-scripted
Pikuniku
No adversary anywhere
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Kirby's Return to Dream Land
Energy sphere hiding spots are static secrets
Pikuniku
Short authored world with few surprises
Kirby's Return to Dream Land leans a little harder on optimization, though the gap is small.
Kirby's Return to Dream Land
Super ability timing and sphere collection are solvable
Pikuniku
Simple puzzles with obvious solutions
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.