The game itself is good and fun, enjoy it a lot. But it’s way too difficult to get sufficient of money (coins) to buy new units, you earn thousands in mission but takes millions to buy new units. Plus, it takes ridiculously long time to build and upgrade buildings, takes days. And the Elite Responder challenge cannot be skipped, means if you do not have the required unit you have to stop the challenge, then it takes millions and days to build and upgrade the unit to finish the job in the challenge, quite bsurd.Also, I am willing to watch ADs to get the blue coin, but sometimes the audio stopped, and you need to turn off the app and start again to regain the audio. It’s troublesome because those alert sounds are crucial in the game.Lastly, is there a choice to disconnect the Apple sign in pop-up when entering the game, it’s annoying.