I've got a partially working version of Asteroids for squeak on OpenGL 
as part of My OpenGL tutorials package. I believe that you can search 
squeaksource and find a space invaders game written entirely in Morphic, 
which is probably slow but suitable for teaching.

My package is on the Open Cobalt repository at 
http://www.opencobalt.org   /contributions  repository directory.

Lawson

On 1/21/12 4:38 PM, Ralph Boland wrote:
> I am looking at open source versions of space invaders games.
> I am contemplating making modifications to the game to make it
> more educational in a mathematical sort of way.   I have found
> one version in Python but now I am wondering if there are any
> Smalltalk versions of space invaders or its variants.
>
> It would be more fun to do this in Smalltalk (preferably Squeak
> or Pharo) than in Python.
>
>
> Other interested parties welcome.
>
> Ralph Boland
>
>
>