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 · Pure Optimization
An alpine horror tale testing puzzle deduction and exploration under light dread.

Optimization · Pure Optimization
A first-person farming game about wrangling adorable slimes for plorts.
Mundaun leans Optimization (Pure Optimization); Slime Rancher 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.
Mundaun
Sparse hostile encounters need only basic evasion
Slime Rancher
Vacuum aiming is gentle.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mundaun
The valley's horrors follow folk-tale scripts
Slime Rancher
Slimes follow scripted behaviors.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mundaun
Alpine secrets are hidden until uncovered
Slime Rancher
Plort prices and slime spawns vary.
Slime Rancher leans a little harder on optimization, though the gap is small.
Mundaun
Hand-crafted puzzles and routes have fixed solutions
Slime Rancher
Ranch layout and economy reward planning.
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.