Incredibly hard and long, but good
Obviously took ALOT of work and thought. For that, I commend you. However, it is a little hard for the average player to finish in one sitting, and you do really have to understand the physics and tiny nuances of the game to play it well (for example, the crow moves forward a bit with each upward flap, your tail can touch most things but your beak can't, etc). It was a fun game, but I didn't feel like I accomplished anything when I beat it; the ending was a tad lackluster. However, it was very original and harkened back to a lot of the hardest parts of classic platformers. Seriously though, if you make a sequel, you might lighten up a little bit on how hard you make it; it's like newgrounds' Ninja Gaiden lol, and personally even that game was easier XD.