Hey, thanks for the feedback! I've already done some changes to the first two battles, added some new content as well but they won't be available until I push another update, which won't happen for another month or two unfortunately.
Just one of the changes is that the game tells you the Bubblemancers can only spawn 3 bubbles each. (After that if no new bubblemancers were to spawn there wouldn't be any more bubbles.) With that information in mind, I hope strategizing a game plan can lead to a smoother experience until I publish the next update :D