head to head
Portal asks more than Hitman Go, and the gap is execution.

Optimization · Pure Optimization
Board-game distillation of Hitman into elegant fully-solvable turn puzzles.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Hitman Go leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Hitman Go
Turn-based taps, zero dexterity
Portal
Portal placement timing modest.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Hitman Go
Enemy pieces move on fixed deterministic rules
Portal
No adversary modeling player.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Hitman Go
All information visible on the board
Portal
Deterministic chambers; no randomness.
Hitman Go leans a little harder on optimization, though the gap is small.
Hitman Go
Each diorama is a literally solvable movement puzzle
Portal
Pure puzzle-solving optimization.
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.