There is a bug in the last level. This css works (the path collision detection allows it):

  .tower-group-1 {display: flex;}
  .tower-1-1 {}
  .tower-1-2 {}
  .tower-1-3 {align-self: center;}
  .tower-1-4 {order: -1;}
  .tower-1-5 {order: -1;}