Ok, I tried again -- when you click on the fly and then on the enemy, a box with two smaller boxes appears. I understand this is supposed to be some kind of mini-game, but I completely failed to achieve any visible result after several tries. Maybe some kind of explanation on the game page would be good?
As far as game-design goes, I think you should decide on the fundamental direction -- do you want you game to be turn-based or action-speed based? (It is also possible to combine both of course, but much harder to reach a consistent whole IMO). So my suggestion would be to either replace the capturing mini-game with some turn-based mini-puzzle OR to add real-time player action to the fight and move the game in that direction