This is a super interesting concept and great take on theme! I think it's very clever for the coins to act as healing for the children. The art is very nice and charming, and the music and sound effects are good.
I just wish you could move a little faster, but apart from that I like the controls, the way you need to aim attacks reminds me a bit of deathsmiles, I like that it adds more challenge and tension to the game.
Great Work! : )