Any key or click/tap and hold to view slowly.
This isn't meant for the game, it's just so that others can get a slightly more realistic feel for the fire. Unless it's very tiny and well contained (such as a candle), fire doesn't just wiggle around. It grows in one area and that area breaks off and drifts, slowly getting smaller until it dies out. This isn't quite as smooth as I would have hoped, but in my defense, animating through reshape is hard enough as it is, but I'm still getting used to the new editor :P