Difficulty: 4/10
Time for me to beat: 10 minutes
Overall Score: B+
Overall, A Fiery Descent is a fairly good world, mostly because of its variety. Some levels require timing, others require precision, and the author uses a variety of blocks and enemies to achieve this. The background isn't pretty, but it isn't distracting either, which makes this level more fun than many others.
This world has fifteen levels, all of which are extremely short. Thus you can beat this world fairly quickly, since once you beat one piece, you never to have to beat it again. Some people may find this makes the level too easy, others might find it helps prevent the levels from being too repetitive.
I would recommend this level for beginning players. For those players it would be a good challenge without causing too much frustration (I should mention the 1-up at the beginning of each level helps). More advanced players might find it too easy, but should still enjoy it.