head to head
Risk of Rain 2 asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.

Optimization · Pure Optimization
A third-person roguelike where item snowballs outscale the difficulty timer.
Portal leans Optimization (Pure Optimization); Risk of Rain 2 leans Optimization (Pure Optimization).
Risk of Rain 2 leans a little harder on execution, though the gap is small.
Portal
Portal placement timing modest.
Risk of Rain 2
Aim and movement matter under escalating swarm pressure.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal
No adversary modeling player.
Risk of Rain 2
Enemies follow fixed AI; no opponent models you.
Risk of Rain 2 leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
Risk of Rain 2
Item drops and stage selection randomized each run.
Risk of Rain 2 leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
Risk of Rain 2
Item stacking and scaling routes dominate run outcomes.
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.