Cute little game! I didn't manage to save all the sheeps but I tried haha. I like the fire particles and the game loop was simple to understand. My main feedback would be:
1. The music was a bit tense but the game felt cute, maybe something nicer might make the game more fun? :D
2. I didn't feel like I could lose, I ended up getting most of my sheeps burnt to a crisp but still went to the next level haha!
Overall, awesome job on this!