Like nabladeveloper, I was also stuck at the elevator section until i read the description below the game mentioning the Enter key to interact with objects. As the game did a really good job teaching me controls within the game, I did not think to look elsewhere for more controls. A small suggestion that I think would fix this issue is including the Enter to Interact hint on the sign next to the elevator that mentions elevators having a size limit.
Also, by scaling myself to the smallest size and running into the wall to the right of the elevator, I somehow managed to go through the wall and fell into the world.
Overall, a solid concept that fits the theme well, and effectively teaches the mechanics to the player in an organic way.