Really cool conept, it was a nice experience to be a rolling duck :D I like the physics and summer atmosphere!
At the beginning I somehow thought that I have to place a crate on the platform to open the door, so I got stuck for a while but then I realized the echo-ability and this was super cool! The echo took a bit long butaside from that, it's an incredibly cool game!! Also, super optimized - it's insane that you made this in 3D and it runs this smoothly :) Great work!!