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

Optimization · Practiced Mastery
A retro-styled turn-based RPG about two solstice warriors.

Optimization · Pure Optimization
A scripted RPG where pattern-learning and pacifist routing carry you.
Sea of Stars leans Optimization (Practiced Mastery); Undertale leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Sea of Stars
Timed hits demand input precision.
Undertale
Bullet-hell dodging in scripted patterns
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Sea of Stars
Enemies are scripted.
Undertale
NPCs follow fixed dialogue trees, not adaptive
Sea of Stars leans a little harder on variance, though the gap is small.
Sea of Stars
Light combat randomness.
Undertale
Minimal randomness in encounters
Undertale leans a little harder on optimization, though the gap is small.
Sea of Stars
Combo and resource planning reward optimization.
Undertale
Learning fixed boss patterns and mercy routes wins
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.