head to head
Left 4 Dead asks more than Immortal Redneck, and the gap is reads.

Execution · Twitch Chaos
A fast-paced roguelite FPS climbing randomized Egyptian pyramids with mummified redneck firepower.

Execution · Twitch Chaos
Co-op zombie shooter whose AI Director reshuffles every run to keep teams honest.
Immortal Redneck leans Execution (Twitch Chaos); Left 4 Dead 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.
Immortal Redneck
Fast FPS aim and movement carry every floor
Left 4 Dead
Headshots, melee shoves, and special-infected reaction time
Left 4 Dead leans clearly harder on reads.
Immortal Redneck
Enemies follow fixed patterns
Left 4 Dead
Versus mode adds human ambush mindgames
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Immortal Redneck
Random rooms, scrolls, and gun drops shape each climb
Left 4 Dead
AI Director randomizes hordes, items, and specials
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Immortal Redneck
Skill tree spending and class picks add a solvable layer
Left 4 Dead
Team spacing, route choice, and resource discipline
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.