"May I please remain in this space,
For darts screech by my desires."
This is actually referring to Twilight Sparkle, the best horse in the world. It is basically saying, 'may I please remain in the same space as Twilight Sparkle because she's awesome and I love that horse?' The darts are possibly referring to her magical horn, which is a part of desiring to be with that beautiful pony.

"Art thou not human man"
This is just saying, 'Twilight Sparkle, you're not a human man. You're a female horse.'

"Life-threatening lifestyles,
A hitman, a nun, lovers."
It is life-threatening to go to Equestria and live there with a horse because humans aren't supposed to go there. The thing about the hitman and the nun makes absolutely no sense.

"Clock men for they will fail,
Fear not the gods who come from the sky,
Long not for the one who's lost their way."
This is saying, that in order to travel to the enchanted land of Equestria and meet Twilight Sparkle, you must go to the gods who come from the sky and use their time-traveling magic to enter a time warp going into Ponyville. But the people who cared about you, like, your friends and family and everything, must not long for you once you've gone, because you are happy now. You are in Ponyville, the most happiest place in all of the world.

This is just what I get out of this song. I hope this interpretation is helpful.