Done, it's live (v0.9.30). Two lines now stay on screen until your first torch flies, and they stay put while you're aiming instead of vanishing the moment you touch the screen: press anywhere, drag backward like a slingshot, release.
Correction: I ended this with "burn ALL the wood" and that is wrong, sorry. The target is the pranksters, not the whole tower - and turning the marshmallow bag black loses the level on the spot. I'm fixing that wording inside the game too.
Thanks for saying it out loud, you were the only one who did.