The subreddit automod filters out very short replies because they're highly unlikely to be actual, constructive feedback. All the 'that sucks' / 'get gud' / 'I love it heart eyes emoji' bullshit gets weeded out.
That also means that if you ask 'which one's better, A, B, or C?' then 90%+ of the replies you get are going to be 'A', 'B', or 'C', and you'll never actually see them.
So just do what the sub's for and post your work for critique and feedback.