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

Optimization · Pure Optimization
A spiritual successor to classic Castlevania metroidvanias.

Optimization · Pure Optimization
Crafting-tree planning and needs management under light zombie pressure.
Bloodstained: Ritual of the Night leans Optimization (Pure Optimization); How to Survive 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.
Bloodstained: Ritual of the Night
Action combat with modest demands
How to Survive
Twin-stick zombie kiting needs modest aim
Bloodstained: Ritual of the Night leans a little harder on reads, though the gap is small.
Bloodstained: Ritual of the Night
Scripted bosses
How to Survive
Zombies are mindless scripted pressure
How to Survive leans a little harder on variance, though the gap is small.
Bloodstained: Ritual of the Night
Shard and crafting drops
How to Survive
Scavenged materials and island layouts are unknown until explored
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Bloodstained: Ritual of the Night
Shard builds and crafting routes
How to Survive
Crafting trees and needs management decide survival
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.