Well done on publishing your game. I really like the aesthetic.
It took me a while to realise I was able to jump consecutively, but once I did I found the game pretty easy after that, except in the wind tunnels. They're a cool feature, but I felt I had very little control once inside, though it didn't cause stop me from progressing.
I felt the jump sound could get a little tiresome after some time. I thought perhaps you could give the character cute little fairy wings that make a flutter noise, and give a bit more context as to how she can jump consecutively. I think I'd also like to see a sort of momentum mechanic in there to make controlling the jumps a bit more interesting and challenging.
Like others, I had optimisation issues. I am on a fairly decent gaming laptop with upgraded ram and I feel like I've played much more demanding games on it in terms of size, functionality and graphics. I suspect part of the optimisation is the use of all the reflective surfaces, and the particle affects really hit framerate too. I think the auto save is unnecessary, and made death irrelevant.
All in all I think it's a neat little idea that has lots of potential.