The one use of end rhyme add a special charge to those mysterious last few lines. Their mystery circles back to the simile that makes up line four, too: The comparison with the "light in which the convict digs his tunnel" seems out of place with the rest of the images in the poem, at least to my ear, until we get to the end, where there's a hint of the narrator's sense of being lost or estranged, some kind of prisoner.
I don't know why he needs that fancy colon at the end of line five!
This is a fine poem. Thanks for posting it and for your comments.
RPW
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