Thanks for the feedback ! Happy that you enjoyed the game ^^
For the movement I was inspired by Super Hexagon, but I understand the frustartion that can occur, it was the first time I've done a kinda arcady game and the circle idea was here since the begining so I decided to keep it.
In french, "Coin" is the word we use for the sound of ducks, and it's also the french word for "corner", and we found it fun to place the duck in the corner of the screen xD