Wave 163 on level 2! I'm improving :D As a suggestion to add is some indicator of when you'll be reaching your next star. I always hope I don't miss the message so I know what star I reached. If it's the same for each level, you may write it in the description.
Also, it would also be nice to somehow see your highscores! It's tracked, but I can't find anywhere to see it!
I like that I can just send 3 or 4 waves at once to speed it up. It's also fun to see so many tanks at once :)