Pixelized minimap works in situations, where you map a symmetrical map. E.g. hexagon or square based map. It can only be created in sizes that match pixel squares (not sure what it is called). So basically object area on the minimap can be either 1, 4, 9, 16 etc. pixels in size.

After plugin has been initialized by the flatworld, you must still call initMinimap to start showing the minimap.