[Abeguy]

I think Game maker games work on all os's
But guys, remember, this is Game Maker, it is Oh so hard to make game maker games Mac compatible if it isn't, so chill and if you get the macs with the intel processors, it might work, cause they'll probably be able to run Windows XP on it and other things previously only working on PC's
and the slig thing, make it so

In the Slig object

in the step action make it so if object_abe is at postion, say, x:100 y:0 and set it to relative(abe is to the right), then make the slig shoot, however you need another one that says if object_abe is at postion x:-70, y:0(abe is to the left) and set it to relative. and then make the abe die thing. that should help