Fair hit, and thank you for saying it - if you couldn't find the controls, that's the game's fault, not yours. It's one gesture: press and hold anywhere on the screen, drag backwards like a slingshot, let go. The further you pull back, the further the torch flies.
Correction to what I first wrote here: I said "braziers" and that was plain wrong, sorry - there are none in the game. You win when every prankster has gone up in smoke (the purple monsters, counted at the top left). And from level 2 on there is a marshmallow bag that has to end up GOLDEN, so burning everything loses.
A proper first-run intro is going in before the jam closes, because you shouldn't have to read a comment to start playing.