So far been having problems getting past the first 3 levels. either timer expiring and I Didn't really get any good troops to merge to do enough damage. or that I didn't get any response when trying to drag a unit to merge sometimes causing them only to drop on one another but the imp always seem to be prioritized causing the unit to explode instead of merging with another.
Kind of reminds me why I hate mobile type of games since touch doesn't always respond as I expect it too, otherwise it might be promising if I can actually get far enough for the content.