OK, I finally got back to this(time is limited when your boss is on vacation sometimes...and I'm lazy sometimes).
After some effort, I couldn't get the toony style to work that well. It seems like the Asteroids looked OK, but I couldn't get anything to look good on the ship, or the alien. So I'm switching to a more "generic" style with the same geometry. It tends to work better from what I can see.
Any feedback for this? I would appreciate it.