I like the form of your poem; it seems to mimic the "flicker flicker." There is some strong imagery as well. "Flies gather and cold spreads." Might I suggest paying attention to the symmetry of the poem? Some parts rhyme, some don't, some lines are parallel, some aren't, etc.
Powerful! I like dark writing, so this poem really grabbed me! I love everything about it. However, the only word that feels out of place to me is the onomonopia "Ding!", because the exclamation point especially makes it seem like such a cheerful word, and the rest of the poem is going for a darker vibe. At least, that's what I felt as I read along.
I like the form of your poem; it seems to mimic the "flicker flicker." There is some strong imagery as well. "Flies gather and cold spreads." Might I suggest paying attention to the symmetry of the poem? Some parts rhyme, some don't, some lines are parallel, some aren't, etc.