head to head
Portal asks more than Denki Blocks!, and the gap is execution.

Optimization · Pure Optimization
A sliding-block puzzle about deducing the right merge sequence per board.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Denki Blocks! leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Denki Blocks!
Sliding blocks has no timing or twitch demand
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.
Denki Blocks!
Solo puzzle with no opponent to predict
Portal
No adversary modeling player.
Denki Blocks! leans a little harder on variance, though the gap is small.
Denki Blocks!
Each puzzle is fixed, nothing random to map
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.
Denki Blocks!
Solving the block-merging sequence is the entire game
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.