First off, I think this is a really cool concept! I like the visuals too, the trees and night sky set the vibe really well. Having to shoot feathers to test if platforms are real is a really creative application of the theme, and it's definitely a mechanic I'd like to see explored more. I have a couple critiques - the controls are a bit awkward (double jump mapped to a separate button is weird to me), and an issue I ran into a lot was that most of the platformers were on the upper half of the screen, so I spent a lot of time off the screen when jumping and was just hoping I'd land somewhere safe.