Neat game with solid visuals. The controls feel a little weird at the start but eventually one gets the hang of it, so good job. I like that you can deal damage while stretching your neck, when releasing your neck and when the neck returns, it provides me with different strats.
One thing I'd say is to prevent bosses from shooting while the loading screen, I was getting hit the moment the black screen went away, which is very unfair. For the most part, the two bosses are really good, I feel the second boss is huge step up from the first, but it's good.
Oh and I found a bug, during the first round with the first boss it wasn't able to shoot, I could see the feathers spawning but they would just get destroyed in the instant.
Another thing I'd suggest is a bit more feedback, the game feels kinda devoid of sounds, pretty empty. But overall really neat game.