3 ** make a semi-transparent plane under the instantiable items
4 ** manage the physics of the to-be-instantiated with a ghost
7 ** implement the operations of the buttons
8 ** create one level per item, then levels with more items
9 *** e.g. item1, item2, item1+2, item3, item1+2+3, ...
14 ** do intro video with moviepy
15 ** itch.io's client works with wine: functional tests for windows-itch.io