A good, solid idea and quite quickly clear what to do, I like this self-explaining feature!)
it's exactly the emount of gameplay I need for a 3 hours devtime project.)

Enjoyed it a lot!

I too would like a score counter to understand how I'm doing.

I can see how this fun base could easily grow: more types of people (varying speeds or movement behaviors, positive and negative points), more elevators. It's kinda like a tower defense game, now that I think of it.

Thanks!

As mentioned, I think a score counter would be a nice addition.  Also, I think stopping the people and spawns when the elevator moves would help with the flow of the game.  Overall nice take on the theme and very well done.