head to head
StarDrive asks more than Portal 2, and the gap is reads.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
A 4X space strategy game centered on modular ship design and empire optimization.
Portal 2 leans Optimization (Pure Optimization); StarDrive leans Optimization (Pure Optimization).
Portal 2 leans a little harder on execution, though the gap is small.
Portal 2
Portal placement requires some precision but timing is lenient.
StarDrive
Real-time combat micro matters but never twitch-defines
StarDrive leans clearly harder on reads.
Portal 2
No opponent; puzzles are static.
StarDrive
AI empires follow fixed strategies, not adaptation
StarDrive leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
StarDrive
Galaxy layout scripted-but-unknown until explored
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
Solving the puzzle's logic IS the entire game.
StarDrive
Ship design, economy and expansion are the solvable 4X 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.