Thank you for pleasant feedback!
We think, that the spaceman, who can switch ships and by himself is quite vulnerable, but has more long distance of catching the boxes, is a key to more deep gameplay. You may use only one ship, if you want, but there are places, where only the spaceman can climb through. Combining advantages of those vehicles may give more effective run.
Also there is another ship hided somewhere around...
We didn't use RayFire. Ships are just divided to pre-modeled submeshes with rigidbody on each of them. And liquid pieces just create smaller copies of them.