This was a very satisfying puzzle platformer! The controls are well implemented - moving around was very smooth and responsive. As everyone else has said, the feather mechanic was enjoyable and creative. The level difficulty scaled really well - from tutorial to the flappy bird stage, there were a lot of interesting ways that the game introduced challenge without feeling unfair (I loved the verticality of the penultimate level!) I think it would be cool if there was a reward, or even just a popup for when you complete a level with the most amount of feathers possible still on hand. I also agree with previous points about the feather lag for recovering in tight situations. The art was funny and cute, and I also love the story on how this game was developed. Well done!