head to head
Vaporum 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
A grid dungeon crawler testing build choices, puzzle-solving and enemy-type counterplay.
Portal 2 leans Optimization (Pure Optimization); Vaporum 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.
Vaporum
Real-time grid-dancing around enemies needs some timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
No opponent; puzzles are static.
Vaporum
Enemies follow fixed behaviours per type
Vaporum leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Vaporum
Dungeon is authored; loot mostly placed
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
Vaporum
Gear loadouts, rig builds and puzzle solutions are the core
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.