This game is utter trash. I was on level 14 of the dungeon, and I was barely surviving, I made it through the door and was going to exit. At that time, I wasn't paying attention and clicked onwards by habit, and died immediately. Half an hour of my time wasted because of an accident. Also, what kind of game has a mute button that doesn't mute everything? That's just annoying.
The hard badge takes almost no skill. I can get the hard badge without passing mars. It's incredibly easy as long as you keep jumping and gain speed, if you get light speed or better, just hold up after that and you've basically gotten the hard badge
 "April Fools 2015 Learn to Fly 3"){kind=icon}
 "Knightfall 2"){kind=icon}
 "Run 3"){kind=icon}
 "Escape the Red Giant"){kind=icon}