Thanks! You can send it to hoffman.jeremy##@gmail.com where ## is the card that burns a tile and also removes all burn and freeze from the board.
FWIW when testing Efficient I finished Hard in 17 or 18 matches in just one try... though that was a few years ago. Tip: If you can solve battle 5 right off the bat, it should be reasonable. (But not easy!) Note that puzzle battles do not count toward your total.
Good point about the explosion, I'll see about adding some more visual effects, maybe some dust or something.