head to head
Shadwen asks more than Portal 2, and the gap is variance.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
Using time-rewind to pre-solve grapple and kill sequences against fully deterministic guard patrols.
Portal 2 leans Optimization (Pure Optimization); Shadwen 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.
Portal 2
Portal placement requires some precision but timing is lenient.
Shadwen
Grapple hook timing and kill windows need care but are forgiving
Shadwen leans a little harder on reads, though the gap is small.
Portal 2
No opponent; puzzles are static.
Shadwen
Guards follow scripted patrol arcs without profiling player tactics
Shadwen leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Shadwen
Child NPC pathfinding adds minor unpredictability to routing plans
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
Shadwen
Time-rewind and rope construction enable full pre-optimisation of every kill sequence
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.