Crystal Cruiser fell right into my lap today. I managed to get the crystal pod on one jump and get c-man out of the pod on the VERY NEXT JUMP, was pretty sweet. Even sweeter that I found a Rock Homeworld, easily found the Crystal Homeworlds from there, and just slid on over to the unlock.
It was actually a fantastic run. I was playing Red Tail and dropped the lasers early on for Pegasus Rockets and a Teleporter (got an early Rock too) in Area 2, and then I picked up Ion Bombs after, and then bought Breach Missiles and Heal Bombs later on. I was actually worried I would run out of missiles, but boarding did most of the work. Even the boss was a cinch with just a defense drone, missile spam, and teleports, with a beam drone on Round 3 for the shield. I actually wanted to get the fire achievement but couldn't set fires on the weapon rooms fast enough.
I also picked up a scary amount of crew (15 in one game) but nobody ever seemed to die so I had to keep dismissing them. On a related note I also got the "get 6 species on the Kestrel) as a result.
Get teleport early and you absolutely roll in the dough, it's awesome.
This game isn't actually that hard, but maybe that's because I'm playing with the easiest ship. I still haven't unlocked any other ships either besides the "beat the game once" ones. Hmmm...