I thought this was a really cute idea! I eventually had to just convince my brain I was playing a platformer with a reversed control debuff or something to be able to remember what I was doing. I liked the experimenting with different heights you did towards the end, would be cool to see how else you could expand on the idea. I did think it was not super intuitive that in a game about controlling the earth the birds moved right along with it instead of flying in a straight path.