head to head
PixelJunk Monsters 2 asks more than Portal, and the gap is variance.

Optimization · Pure Optimization
A tower-defense game about placing traps along paths to protect baby monsters.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
PixelJunk Monsters 2 leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans a little harder on execution, though the gap is small.
PixelJunk Monsters 2
Some real-time placement timing under wave pressure.
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.
PixelJunk Monsters 2
Enemy waves are scripted, not adaptive.
Portal
No adversary modeling player.
PixelJunk Monsters 2 leans clearly harder on variance.
PixelJunk Monsters 2
Wave composition adds some unpredictability.
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.
PixelJunk Monsters 2
Tower placement and upgrade paths are deeply solvable.
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.