Almost fully realized
This is actually very, very good. The music is charming, the graphics are cute, and the concept, while very similar to ilomilo, is unique enough to stand on its own. However, the gameplay itself lacks in certain ways, which for a puzzle game is insufferable. The controls and unorthodox viewpoint are very confusing. The character movement keys are coordinated to the world, not to the character's viewpoint, so each character has to control oppositely. I personally would've been better able to move around if the arrow keys corresponded to the character (up is always jump, left and right is actually move left and right).
Of course, this could've been avoided altogether and been that much simpler if, instead of the characters being vertical and split across the screen, every time you switched characters it flipped right-side up - horizontally - to each character, a la ilomilo. It's just very confusing to control characters that walk sideways.
Besides that, this is a very good game, with clever puzzles, medal challenges, and multiple paths.