head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Optimization · Pure Optimization
Cozy space exploration and base-building sandbox.

Optimization · Pure Optimization
Procedural space exploration sandbox with crafting depth.
Astroneer leans Optimization (Pure Optimization); No Man's Sky leans Optimization (Pure Optimization).
No Man's Sky leans a little harder on execution, though the gap is small.
Astroneer
Light terrain tool inputs
No Man's Sky
Light shooter and flight inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Astroneer
No adaptive opponents
No Man's Sky
Mostly solo, sparse PvP
No Man's Sky leans a little harder on variance, though the gap is small.
Astroneer
Planet resource distribution
No Man's Sky
Procedural planets and loot
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Astroneer
Base layout, power chains, automation
No Man's Sky
Base, freighter, expedition progression
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.