Really fun game. I enjoyed it, and didn't find the control or upgrade scheme too annoying. The only time I had to 're-tweak' my upgrades was when I realized I needed the jetpack right away to get all of the energy in hard mode and I certainly never spent an hour on any level. I thought the defective robot was a clever idea, and though it was at times annoying when it seemed to fail the odds and cause you to die I doubt anyone complained when chance favored them and they got a string of bullets or good jetpack runs when they only had 10% chance.
One thing I did notice was that after I saved the universe a second time even though it showed the medal in game Newgrounds didn't catch it. So I don't know if that is a problem with the medal itself or what. All of the others transferred just fine. Oh well, at least I got fireworks the second time.
And another thing. I don't know if you have the hard mode stuff linked to a users newgrounds account, but I was able to enter it on a different computer by pressing H even though the menu option did not show up. I wonder if that could be the reason the medal didn't show properly? Sad.
Anyhow fun game with an interesting concept I thought it was well worth playing through twice for the medals and alternate ending. Keep up the good work. 5/5 and 4.5 stars.