I love good feedback, I appreciate all the help and time taken to play my game :). I couldn't agree more that my game has balancing issues, the main reason why some waves spawn fewer enemies is probably due to the money-based wave system I used, I assign the game manager a set amount of money per wave (wave money = 10 * WaveNumber). So it automatically fills an array with enemies that cost a set amount, e.g. normal bipedal enemies cost 1, slimes cost 10, and the big enemy costs 45. I think right now the slimes are not dropping enough coins creating a large rng factor in the game, I shall see what I can do to fix this.