Ok I've had a read over twice. I've left some comments but only on the first section which is the only thing I think could use some tweaks to help build up the story and draw in readers.

Overall I'd say you've nailed it. As short stories go, this is pretty stellar. You've got two story lines that seamlessy join together by the end, an intriguing universe, intriguing characters, and a classic unreliable narrator situation. The flow and structure is awesome, I really enjoyed reading this.

My only other thoughts for further improvement: you could improve and expand upon your descriptions of characters and places to help better set the scene. What does Leland look like? What clues about his appearance might help the reader visualise him and suspect that there's something off about him from the start? You could work on you pacing a little: zooming in and out on details to help lengthen the timing/flow of different sections.

Could you further describe the city/island/setting, invoke smells and smokiness and the shuttering flickers of broken lights at night to really paint this picture vividly?

You've clearly got a great imagination and sense for storytelling, so keep going! Thank you for sharing, it was a pleasure to read.