Still completely impossible.
The second the Goliaths come into play, it's over. I thought the casual mode would make it so they wouldn't come in and start raping your base from the get-go, but I was wrong. None of your weapons can kill them well, your defenses can't kill them well, and they end you pretty quick.
Normally I'd say nice job for the graphics and all that, but I'm sure you'll agree that you don't deserve THAT much in that category, seeing as it's all ripped, with the exception of the special particle effects, like the ball of energy from the spore colony, and the HUD.
The fact that you would design a game that's completely impossible is mind-boggling. Your weapons, defenses, etc. CANNOT END GOLIATHS AT ALL. I managed to kill, oh, 5. By that point, though, you're sitting, waiting for your energy to recharge, with your sunken colony obliterated. your spore colony unable to hit anything that's close enough to shoot you, and your health being halfway to 0 anyway.