what it does is it generates lua code for you based on what you "feed it"
its still in its early stages but it looks like its very do-able.
you can download it here
http://www.laredowebmasters.com/psp/apps/gamemaker/
i created this in 2 mins using this program
it still need more functionality , right now it just lets you load up to 50 sprites and a background and set a few controls