I think I found the bug that has been causing the random crashes, but the more I looked at the behaviors of the crashes I had been getting, the more I think there is more than one crash bug present, as many bugs show completely different characteristics prior to crashing.
Turns out I may have been wrong about the missiles(ish), it seems that one of the problems was stemming from the chunks the missiles spawned after they explode... I'm not sure why doing what I did fixed it, but I haven't been able to get it to crash as of yet on my machine, so maybe I fixed it(although I highly doubt it)
Anyways, here's the new version, all it has added is that bug fix, so let me know if the game crashes less, and any information as to what was going on in-game if a crash occurs.
Thanks to everyone who's been helping me out by testing this demo and reporting bugs, you've all been a real help, and keep up the good work! Peace Out!