Very good game, I have fond memories of playing it back in the day. Downloaded it yesterday for the iPad and have been playing it a lot.
I think my only criticism so far is that the interface is a bit... tricky to learn. Some screens were a total mystery without using the help function, and in places tapping something maybe didn't do what was expected.
It would be great to be able to interact with items on the system/star/colony map directly rather than having to select something then tap it again at the bottom of the screen. Some form of menu popup would be perfect here.
Also I found the screens for building colonies and ships convoluted. Partly for the reason above, with things taking perhaps a few more taps than they should, but also the lack of any kind of text labels just slows things down.
I'm not knocking the game itself, the logic factory have done an excellent job, but there are a few interface tweaks that would certainly help new players really get into the game.