(Disclaimer: I am a friend of the dev.)
This game is...
It's bittersweet, and chill, and comfy, and affecting.
And the concept is such an excellent match for the story!
Combined with some really good writing and a lovely, comfy art-style, this is such a good, and intelligent, and empathetic experience, I find. ^_^
... Or, I should say, for me it was: as the description says, each player only gets to play it only once, and for me that once is completed.
And I'm sitting on the title screen, unwilling to close the game, just listening to the (beautiful) music as I type this.
But in due course it'll be time for my ship and that of this game to complete their transit, and pass by each other in the night...
So let me say more only this: if the game sounds good to you, I suggest that you take the time to cross your path with its, and see where the journey might take you...