* issues
* todo
-** mouse cursor
-** music and sfx
+** make a semi-transparent plane under the instantiable items
+** manage the physics of the to-be-instantiated with a ghost
** instructions
** main menu
-** configuration (physics debug)
-** rotation with vectors/quaternions (fixes some glitches)
** implement the operations of the buttons
+** create one level per item, then levels with more items
+*** e.g. item1, item2, item1+2, item3, item1+2+3, ...
** build pipeline
** magnet
* waiting