Finally full cleared! Super fun concept and extremely well polished. The tutorials are especially well done and explain the gameplay really well. I also felt bad shooting the wisps until one of them blocked my dynamite shot, making me redo the level XD.
PS: I think I found a bug where if you put the dynamite on the furthest points on each side, they will trigger each other. Happened to me when I was trying level 9 specifically but I think it's probably just generic.