Walkthroughs for custom maps.

Ah yes, here's a save for those who want it. I have no doubt that your intuition is better than mine.

I passed it after about 10 tries (or less) and didn't even feel any difficulty.
But now it turns out that I did something wrong again. I have a feeling that 1 fairy won't be enough for me to progress further. Could you please indicate how many fairies I am allowed to lose?