[CuriouslyC]

Code review matters when you have a product that has an indeterminate lifespan. When new people come on, they need to learn the codebase and code review both helps ensure a codebase that is easy for new devs to understand (because hard to understand code doesn't survive review) and also it provides an onboarding experience as new devs can be coached during code review.

"One and done" products like games where you're mostly fixing bugs and releasing new content without major overhauls to the underlying code probably only need code reviews for code that is complex/clever where bugs are likely to be hiding, beyond that QA is fine.