This would have been a 5 star game, except for the fact that at some stage there was nothing I could do except either start anew or lose the same level over and over and over.
In most games of this sort, if you lose a level, then you get some (albeit a lesser) amount of money, or else you can go back and try earlier levels, or something so that you can try and upgrade and increase your chances of winning. I reached the stage where the boss spawns little creatures that temporarily stop you being able to hit with the lightening. Both the boss and these creatures are additionally immune to electric balls and the orbital strike. Although I had developed my lightning to some extent, it was apparently not enough, and there was essentially nothing I could do but die. When you die at a given level, the only options are to start again from level 1 or play exactly the same level with exactly the same resources... Given that the only way I can think of to beat that boss is to have stronger lightning, there is nothing I can do...