I love all the places you can go--it feels like you're indeed exploring the galaxy. Not all the missions are about fighting, which is a refreshing change. There's enough variety in the types of things you have to do for each 'episode' (their term for 'mission') that it doesn't feel like grinding.
After some searching about the crafting system, I found some links that I thought I'd share with you all. So many people have so many questions about this.
And for those of you who actually want to breed different kinds of tribbles, here's a guide:
And, in case you actually want a wallpaper on this, the Tribble Evolution flowchart wallpaper
Hope those help a bit.