Fun once I was able to get it started and understand how things worked. I enjoyed making strategies to maximize, not really my time, but my wax and fos output.
I do have some suggestions. The beginning of the game is really confusing and really boring. The fonts were very hard to read, I was confused on how the candle selection worked and why I couldn't craft anything. I also found it boring to just sit there and watch my single candle slowly die over and over again. That being said, after I got over those difficulties, I was able to have a much better time; however, the start of the game is where you lose the most players. Maybe you could start of with more wax and fos (I was also very confused on what FoS is and how to get it) or start with a couple of candles already crafted, just something to introduce players to the possibilities of your game. I would also make it more clear how FoS is produced because it seemed to be a highly limiting factor to the kinds of candles I could create.
Overall and enjoyable experience. I had fun exploring the different types of candles. Polishing the introductory experience is the bane of most Jam games, but I'm sure you'll be able to fix it up given more time. Good luck with whatever you decide to do!