Dear VegeTato,
First thing is, I think this game is so good looking and cool!
In my opinion, you executed your idea flawlessly. Game mechanics are really solid and well executed! Complexity level is increasing gradually. Puzzles are well thought.
I think that using G and Y keys is a new thing and really applicable to this game. Controls became more compact when you get used to it. I should admit that it was hard at first few minutes. And last level was harder because of multiple jumps with changing characters.
Little jokes which are carrying role of limiting the level are really funny! I laughed at the dog one :D
Changing between characters becomes intuitive after a few minutes which shows your success at tutoring player.
The game made me curious about which character will unlock next.
The duck level made me sweat a little bit :D
Sound effects and music is on point.
I really liked the idea behind it and the execution. Well made !