"After each stage, you can spend your space credits on some new firepower and even a new craft. However, these are very expensive. You will have to slog your way through a lot of missions before you can even begin to think about upgrading."
"Galaxy on Fire is testament to how great mobile games can be, and will appeal to space shooters everywhere. Some harsh time limits in later missions can irritate, but as with most games, practice makes perfect. The scale of the story mode and the galaxy setting will keep you coming back for more."