oh, I think there's a problem with the current build where the red and blue folders spawn at the same position. you can drag the folders around to see both of them.
edit: uploaded a new build that should solve the spawn position of the red folder
Also a small complaint, it's frustrating that even when you let go of a group of mines, they stay selected until you click on something outside the group.
There is no indication that they are still selected, and it's awkward that I can't move a single member of the group somewhere else without clicking outside the group first. Like I have a group of blue-blue-grey-blue because the grey spawned in as I dragged the selection box, I can't move the last blue to the left side without deselecting everything manually, and that feels very unintuitive. Being able to pick up the group where I left it is fine but this is very bothersome.