Crazy, I hadn't seen that happen. The gray block is supposed to block the flame so you can pass. I will check it out and see what is up.
Thanks for checking it out too! My hope is to create more puzzle elements as I go here, but we will see how many things get implemented with the time remaining. My goal overall is an puzzle-y, arcade-y feeling game.
EDIT: Bug has been squashed and new version is uploaded.