Super Hexagon creator, Terry Cavahagh created a unique platformer game back in 2010 for PC that was eventually ported to DS3 and is now available on iOS. Although not an actual flashback, this game is definitely the perfect example of retro gaming done right. In addition to bringing the full game to iOS.
VVVVVV is a 2-D pixelated platformer staring a smiley-faced gravity-flipping guy who is on a mission to save his friends and escape from the space station before it is destroyed. Instead of jumping over dangerous gaps, flip upside down and walk on the ceiling.