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

Optimization · Pure Optimization
A chaotic comedy adventure whose elaborate multi-step puzzles test patience with absurd causal chains.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Deponia leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Deponia
Point-and-click with no timing elements
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.
Deponia
Comedy adventure with scripted characters throughout
Portal
No adversary modeling player.
Deponia leans a little harder on variance, though the gap is small.
Deponia
Deterministic puzzle world with fixed solutions
Portal
Deterministic chambers; no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Deponia
Convoluted Rube Goldberg puzzle chains demand careful causal mapping
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.