Man, I'd shake in my hecking boots if in the middle of my sleep I heard "Now let's return all to Nothing"
Quite fun platformer. Never played SMW, does the aerial turnaround conserve momentum in SMW too? It's like the first time I learn of it.
Little nitpick: I'm wondering if the crows spawning could be less random. Saying this because RNG may sometimes decide you stay in one place before you continue your progress - like when you're scaling the mountain after going up the waterfall. Or when you fall down in the vines pit after bouncing off crows through the sky, the only way to continue after reaching the wall is to wait for a well placed crow. (or even trying to get the Feather item. Sure it's a challenge but this is the most reliant on RNG)
I had a good time with this one. I included this game in my Jam showcase here (and yes it's so good I played it multiple times over):
https://youtu.be/DgMV-QbPx7g?t=2612