head to head
Kill It With Fire asks more than Firewatch, and the gap is execution.

Optimization · Light / Casual
A first-person mystery about a fire lookout in a Wyoming forest.

Execution · Light / Casual
A comedy sandbox testing nothing harder than enthusiasm for collateral damage.
Firewatch leans Optimization (Light / Casual); Kill It With Fire leans Execution (Light / Casual).
Kill It With Fire leans clearly harder on execution.
Firewatch
Walking and radio dialogue only.
Kill It With Fire
Swatting spiders needs only loose aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Firewatch
No adaptive opposition.
Kill It With Fire
Spiders scuttle on simple RNG, no minds here
Kill It With Fire leans clearly harder on variance.
Firewatch
Minor environmental discoveries.
Kill It With Fire
Spider hiding spots are unknown until flushed out
Kill It With Fire leans a little harder on optimization, though the gap is small.
Firewatch
Few systems to optimize.
Kill It With Fire
Checklist objectives and weapon unlocks, deliberately shallow
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.