head to head
Noita asks more than Spelunky, and the gap is optimization.

Optimization · Practiced Mastery
Pixel-physics roguelite where every pixel is simulated and lethal.

Execution · Twitch Chaos
The original procedural platformer that codified the modern roguelike action loop.
Noita leans Optimization (Practiced Mastery); Spelunky leans Execution (Twitch Chaos).
Spelunky leans a little harder on execution, though the gap is small.
Noita
Real-time platforming and aim under physical chaos.
Spelunky
Tight platforming and whip control under constant threat.
Spelunky leans a little harder on reads, though the gap is small.
Noita
Scripted enemy AI.
Spelunky
Enemy AI is scripted; no adaptive opponents.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Noita
Procedural world and wand drops dominate runs.
Spelunky
Procedural caves and item rolls shape every run.
Noita leans clearly harder on optimization.
Noita
Wand crafting and pixel physics reward deep mastery.
Spelunky
Hell route and shortcuts reward solved knowledge.
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.