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.

Optimization · Pure Optimization
Budgeting steam movement and loadouts against hidden but scripted alien positions.

Optimization · Pure Optimization
A first-person farming game about wrangling adorable slimes for plorts.
Code Name S.T.E.A.M. leans Optimization (Pure Optimization); Slime Rancher leans Optimization (Pure Optimization).
Code Name S.T.E.A.M. leans a little harder on execution, though the gap is small.
Code Name S.T.E.A.M.
Manual third-person aiming adds a real but small hands layer
Slime Rancher
Vacuum aiming is gentle.
Code Name S.T.E.A.M. leans a little harder on reads, though the gap is small.
Code Name S.T.E.A.M.
Alien AI runs fixed behaviours, never modelling you
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.
Code Name S.T.E.A.M.
Unseen enemy positions and overwatch threats are hidden information
Slime Rancher
Plort prices and slime spawns vary.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Code Name S.T.E.A.M.
Steam budgeting, loadouts and positioning are the solvable core
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.