[@Alexander Evstyugov-Babaev]
When I saw that "them" after "encumber" the voice in my head said "WTH?" Then I visited musescore and got the answer.
So, IMHO, different formatting would help to avoid the confusion:
Worries don't encumber
Them, so rest, you too, don't weep.
And the same down below with "encumber us"
That's my personal rather humble (kidding - I'm rarely humble) opinion - rhymes are more important (including their immediate "visibility" at the ends of lines), than finishing sentences staying within the lines where they begin - I think the latter is rarely achievable, or those would have to be very short sentences.
Among other impressions - I liked the "toy rake - snowflakes" rhyme. Creative. In general, English often makes you look for two-word combinations to complete a feminine rhyme. Not easy.
Музыка: Евгений Крылатов
Слова: Юрий Яковлев