It's certainly quite original, but there are a number of things that I would like to see improved. First, it's annoying that you need to open and close the doors with space (just open them when I'm on a floor). Another issue is that the elevator's movement isn't grid-based (it can float between the floor and only snaps when pressing space). Great aspects are the variety in buildings, colour palette (though hard to differentiate what floor colour someone has), the music choice and font choice.