Thanks for your admiration, but the reason I haven't been on in such a long time is that my computer crashed a long time ago and I lost my files for the games I've been making.
I am in progress of creating a similar Callisto game (a better approach by learning from previous developemental mistakes) but I'm not sure if I would be able to complete it... I'm just not on that much anymore; I work on gamemaker at most once a week. :\ It's mainly a small activity I do when I am completly bored.
I may release a source code sometime, it of course won't be the original game but something close. But for now I guess I can consider it abandonware.
Sorry for the delay!