head to head
Spelunky asks more than Dead Cells, and the gap is variance.

Execution · Practiced Mastery
A metroidvania roguelite testing reflexes through randomized weapon kits.

Execution · Twitch Chaos
The original procedural platformer that codified the modern roguelike action loop.
Dead Cells leans Execution (Practiced Mastery); Spelunky leans Execution (Twitch Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Cells
Tight platforming, parries, and dodge-rolls demand precise inputs.
Spelunky
Tight platforming and whip control under constant threat.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Dead Cells
Enemy patterns are scripted; no adaptive modeling.
Spelunky
Enemy AI is scripted; no adaptive opponents.
Spelunky leans clearly harder on variance.
Dead Cells
Weapon drops and biome layouts randomized per run.
Spelunky
Procedural caves and item rolls shape every run.
Dead Cells leans a little harder on optimization, though the gap is small.
Dead Cells
Build synergy and biome routing significantly improve runs.
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.