It's a really cool take on the TD genre! The forking mechanic to sort the fairies is genius. I also really enjoyed the writing.
The others below already pointed it out, there's a number of bugs and need to improve the quality of life features. The main gripes I have: the "redirecting zones" are too big. I think what would allow much needed tighter control over the forking mechanic is a way thinner redirecting zone, or even making it a line. That way if a fairy passes it, there's no ambiguous turning back and most of all no trying to separate stacked fairies.
Also I found that it's due to the arrow signs that fairies just hug walls (maybe?)? I show it in the video I made below (which is a showcase of this Jam's games)
https://youtu.be/DgMV-QbPx7g?t=4521