head to head
Grand Theft Auto V asks more than Rocketbirds: Hardboiled Chicken, and the gap is reads.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.

Execution · Practiced Mastery
A cinematic side-scrolling shooter about a revolutionary chicken commando.
Grand Theft Auto V leans Execution (Practiced Mastery); Rocketbirds: Hardboiled Chicken leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Rocketbirds: Hardboiled Chicken
platforming and shooting precision needed
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Rocketbirds: Hardboiled Chicken
scripted enemy AI, not adaptive
Grand Theft Auto V leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
Rocketbirds: Hardboiled Chicken
minimal randomness
Grand Theft Auto V leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Rocketbirds: Hardboiled Chicken
level routing and weapon use
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.