Agreed about the text. I've since learnt more about rendering text in Unity, so I'll have more font options in future.
On the torch not always setting things on fire - that's by design. A single torch isn't hot enough to ignite certain objects, like a tile-clad roof. The idea is for you to have to find more flammable objects to ignite first that allow the fire to spread to the more stubborn areas.
That said, some levels contain objects that look like they should catch light more easily than they do. I had to fudge the numbers to make the level more interesting to play - room for improvement there.
Still, glad you enjoyed it!