appleからfeedbackが来た! なるほど、確かにジャンケンアプリとapp Iconの萌え系イラストの関係性は全くなかった(笑) 割とまともな審査のようです。
Your app’s metadata contains misleading content or content that is intended to deceive users.
Specifically, your app’s icon is irrelevant to your app’s content.
Once your app is fully compliant, resubmit your app for review.