Embergram comes from Matthew, Bryan and Jacob Gillespie. Their game is very very similar to Thermometer puzzles. (More Thermometer Puzzles).
Each section has relatively easy levels with straight matches only. As the matches get curvy, they get more interesting.
What could be better: there should be an element that marks squares that cannot be burnt!
There are 12 levels for each grid size: 4x4 to 12x12. I've spent a lot of time on this game. The 12x12 levels take about 20 minutes.
Gillespie clan: you guys rocked this.
Developer website: http://umvirate.com/