All levels:
Very flat, very flat, very flat. Flat and light, flat and light.
Flat and light, flat and light. Flat and light, flat and light.
Metric features: there are no awkward sentences throughout, the first sentence enters rhyme, and the rhyme is eleven truths. Most of the sentences in the poem belong to the form of XX/XX/XX.
I haven't done this kind of analysis, but I have some experience in writing poems, and I can see the metrical characteristics above. As for the so-called metrical features, I have to use some modifiers, such as cadence and so on. I'm not good at this form of analysis.
The rhythm of poetry, in my understanding, is the influence of the flat structure and rhythm of a poem on the feeling of reading poetry. What is the relationship between the two ... I recommend you to read On the Rhythm of Poetry by Qi Gong.
I can only answer so much, I'm sorry.