Endless lights on the horizon.
This song gives me a relaxed feeling, because of the amount of echoes.
Perhaps that symbolises the sound that bounces of from the sky scrapers as you travel in the city of endless lights.
The high tones make me imagine of all the lights that shine on the horizon.
There are not a lot of different instruments involved, only a piano.
You might want to have put a bass in it or have the lower tones of the piano come out more.
Because of that it now feels a bit 'flat', which can be good but you have put lot's of 'empty spaces' in your song.
For example, ~0:53, it seems like the actually song is only starting there, until ~1:25 where there is again a pause.
Because of all those pauses the song is missing a bit of a climax, and again it feels 'flat'.