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You did well, considering you're a beginner.
Literal
Beginner [in-a-manner-befitting-なりに] did-well.
~なりに ('in a manner befitting X, in one's own way, as suits X') is a useful pattern for expressing 'appropriately to one's level or role.' It's often used in grading — 'good for a beginner,' 'respectable for a child.' Built on the classical noun なり ('shape, form, manner'). The phrase frames the evaluation with an implicit comparison to the subject's level.