Very unique take on the theme and amazing realization in terms of sound and artstyle. :) The obvious strategy of course is going up and down, stopping at every floor. However you will realize quickly, that in order to maximize your score you have to mentally keep track of where each passenger wants to go. Love it! Only weak spot are the somewhat wonky controls: would have thrown away the one button idea entirely and used one button to go a bit up, a different button to go a bit down, so pressing none of the top stops the elevator where it is. This would keep the feeling of the liftboy cranking like crazy to go up and down, but make stopping the lift more intuitive, thus give the player more cognitive capacity to remember where every passenger wants to go. And it would transfer to mobile as well: press the upper half of the screen to go up and the lower half of the screen to go down. Just my two cents...
My game: https://njamster.itch.io/wonkey (playable in browser)