Nice! I especially like the red-white umbrella starship. :-D
Textures can add realism, but they can also kill the feel of the game. One thing I've learned is, don't try to be like the big game companies. I think, you could go for textures, but I suspect it would take much more time to get it "right".
I'm afraid of programming in 3D so I'm going to run away now.