Invazion is on the list of possible new developments.

So far a multitude of Space Invaders type applications has appeared on the app store and this was really only written to kick start game development. Not sure if development of this application or project-r will continue or it will be discontinued.

If you really like either Invazion or Invazion Project-R then email me and if there is enough interest maybe it will be continued and enahanced.