head to head
Neither is simply harder - they are hard in different places. Last Day of June demands more variance; Portal 2 demands more optimization.

Optimization · Pure Optimization
Iterating cause-and-effect sequences to untangle a fixed narrative puzzle.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Last Day of June leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Last Day of June
Slow walking and simple interactions, no dexterity
Portal 2
Portal placement requires some precision but timing is lenient.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Last Day of June
No opponent - a fixed narrative system
Portal 2
No opponent; puzzles are static.
Last Day of June leans clearly harder on variance.
Last Day of June
Consequences of changes are hidden until tried
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans clearly harder on optimization.
Last Day of June
Sequencing the four characters' actions is the puzzle
Portal 2
Solving the puzzle's logic IS the entire game.
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.