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

Execution · Pure Mechanics
A pastel dream-themed rhythm game that removes the note highway and trusts your ears.

Execution · Practiced Mastery
A playable pop album blending rhythm, racing, and shooting into a forgiving stylish ride.
Melatonin leans Execution (Pure Mechanics); Sayonara Wild Hearts leans Execution (Practiced Mastery).
Melatonin leans a little harder on execution, though the gap is small.
Melatonin
Timing without note highways leans on audio-visual feel
Sayonara Wild Hearts
Moderate dodging and timing, deliberately forgiving
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Melatonin
Scenes are scripted
Sayonara Wild Hearts
Scripted pop-album set pieces
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Melatonin
First encounters hide each level's cue language
Sayonara Wild Hearts
Fixed levels with memorizable layouts
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Melatonin
Internalizing each dream's rhythm pattern
Sayonara Wild Hearts
Gold-rank score chasing rewards route learning
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.