3/5 great graphics, and lots of good ideas, but too easy to die randomly. My best distance started with my worst launch (<4 million feet from an initial mis-launch of only 10, 000 feet) so the cannon becomes irrelevant once you get golden gun.
bit of a learning curve, then no challenge even on hard. Needs a greater difference between easy, normal and hard. I'm guessing those complaining too hard aren't using electrics (in combination)
Good game, but does get too repetitive, and once you figure out a winning strategy, there is never a need to break from it. Which is why I downgraded my rating to 4 stars.