Interesting concept, had to try a few times to understand all mechanics, but focusing on power first seemed to be the way to go. Having the strategy picker separated makes it a bit tedious on the player to use and to drag and drop about 100 times to complete the game, maybe keeping the previous strategy would help instead of resetting. Also the destroy power seems to destroy all monsters but when you come back from your strategy, the new wave is still there which seem weird. Good ideas though