make the number of passengers increase by time such as increase from 1 per sec to 10 per sec so that this game can have a end I've played the level of London for 3 hours and the number of passengers are so few so I stopped operating the elevator at 5000 passengers, day 134 (I think is was this), I meant to make it 10000 but it is already 23:30!!!...

Add an option to choose starting floor 0/1. Remember the pressed launch key - often I press it a little bit too early and then wait.. and wait... and eventually press it again to launch the elevator. Add rush hours and quiet hours - people are more active in the mornings, lunch breaks and evenings....

I would like to suggest that, with each upgrade in the elevator, there was no interruption in the game, because when playing with the keyboard, having to stop and click the mouse to choose an upgrade, I lose my mind about the game and my performance is compromised......

a rank of friends or a global rank?