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

Execution · Pure Mechanics
A radio-controlled car racer through houses and supermarkets with weapon pickups and hidden shortcuts.

Execution · Twitch Chaos
Rapid-fire reflex bursts against randomised waves in ten-second chunks.
Re-Volt leans Execution (Pure Mechanics); Shutshimi 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.
Re-Volt
Twitchy RC car handling punishes sloppy steering
Shutshimi
Ten-second waves demand instant dodging and target triage
Re-Volt leans a little harder on reads, though the gap is small.
Re-Volt
Multiplayer item duels add a thin mind-game layer
Shutshimi
Enemies spawn from random tables, not a mind
Shutshimi leans a little harder on variance, though the gap is small.
Re-Volt
Random pickups swing race outcomes
Shutshimi
Randomised waves and absurd power-ups reshape every run
Re-Volt leans a little harder on optimization, though the gap is small.
Re-Volt
Shortcuts and car-class knowledge reward study
Shutshimi
Upgrade choices under time pressure are a thin layer
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.