I second linty's comment on killing the enemy when the bar above resets to "you" when it your first move, then striking the opponent for a second time to get more loot. Additionally, if you match (2x) 3-matches before you get to the next enemy, you can get those matches free and the bar resets to "you" as your first move. So, planning moves in advance is the key!
Please fix this BUG!!! I was on the last enemy of "X" level and used a magic (Time Warp), then I looked at the board and couldn't see a single 3-match. So, when I went to hit the Scramble, nothing happened!!! Every single mana was full (besides energy; -15 for Time Warp) and I couldn't use my weapon. Everything was grayed out (inaccessible) and I was grinding (had 319 treasures collected). So I had one thing left to do - REFRESH the page. I am so dissappointed! Please have a fix for this!!!