Cuuute! This was a nice quaint little platformer with really bangin' pixel art and a sweet little dialogue system, and it just felt clean and precise to play and control. It was pretty quick to pick up, and before I knew it I was flying around with the dash feather. I couldn't quite find the other feather or legendary item, and after bouncing on Calli's head about five or so times, we left the battle -- but I couldn't press E on her again, or on AO-chan; but was able to end the game. The single upbeat music track did get a touch repetitive after the 30-minute mark, so it will be great to hear a diversity of tracks for different visual themes as you build them out!
In all, light and fun! I love the planned updates you laid out for the game too, I will come back and play it when it's there!