Perhaps I made the wood burning too slow. To burn it, you need to blow up more than one canister next to it. Unfortunately, I didn't have time for other people to try out the game before posting it.
Understandable. I was able to burn the tree and get the "Congratulations" message. I'm not sure how many canisters it took me. 5 at least, though. I did not see the evil present.
