Salesforce LMTS Frontend Code Review Assessment - What Went Wrong?

Just got rejected from Salesforce LMTS Frontend after their code review assessment. Pretty bummed since I prepped hard and made 25+ review comments following slacks best practices.

Recruiter just said I "didn't exceed the cutoff" with zero details on what went wrong. Makes it impossible to know what to improve. Anyone been through their code review process? Do they focus more on finding bugs, code quality, or what? Any tips on what they're actually looking for would be awesome.

Really want to nail it next time but hard to improve without knowing where I messed up.