Beautiful, pretty smooth, and lots of fun! I did have to quit and reload the page to trigger the interaction atop the mountain, and I haven't figured out how to get all the stars yet. But there were fun quirks to find so far (like using momentum before you can dash), so I'm going to try to finish it all by finding the stars!
EDIT: The map could really use some more detail. It's hard to see yourself on it, and it indicates very little. A star counter would also be nice for QoL. I think I've gotten all but one, which I can't seem to get jump high enough to reach (image after spoiler). Still fun!
PS: That ending is beautiful. I don't remember the last time I read a line as touching as
SPOILERS
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