I'm a bit of a Star Trek fan. Not that I'm wearing a Star Trek badge on my T-shirt, or have false Spock ears to wear, or would beam up my girlfriend (hahahhaha!), but enough to try out the game.

First off, regarding your models, it seems like the model has inverted faces, which makes it look like transparent.
I've checked out the models in Truespace, and oh my, something is definatly wrong with the models. Parts of the model are missing, and I got an error while loading.
Which model of the four Enterprise models is the one ingame? The 3ds model? If it is, you'd better try to convert it to .x or .DBO. If you can't, send me the 3ds file with the textures, and I'll do it for you.

The Enterprise model does look awesome, though.
The graphics are simple (stars, universe, etc...) but, it still looks nice and kinda oldschool. I would add more visual effects, but that's just my personnal taste.
The gameplay is simple and effective. Had to wait a bit (without losing too much power reserves) before getting into battle, and for some that is no problem, but for others it might. You could for instance add more visual beauty to make the parts in between the missions (while viewing the Enterprise go to it's next mission) less boring? Just a suggestion, though.
The music is great! Even if it is midi sounding.

Overal a good game experience and a lot of potential to make it a great game.
I haven't played the game long enough to know if all the missions are just killing the bad guys, but if so, then a bit of variation in the missions would be great.
Good work, Rasdini!