4 stars: Game is Great! I woud play this game 24/7 before and I would reinstall it because its fun to me seeing a new clean feeling. And yes, ads are a thing here, but just turn on airplane mode(for you guys that are dumb and are writing 1 stars reviews about the ads)and then boom, ads are gone. This is also a very good game for my anger as well. In short terms, this game is good and ads are free to remove :D
3 stars: Simple game to kill a little time. The upgrades don't really feel like they do anything but the missiles you unlock are cool. More ads than I'd like but not too bad. Uninstalling because I lost my progress after I had to reset my phone.
5 stars: I think I just love this. It's fun, not clogged with ads like almost every other android game, this is really good to have such a little amount of ads! So many games only care about the money and don't necessarily make a very good game anyway but fill it with ads after every level, this is good for once with very few ads. Thanks.
3 stars: Simple and fun game. Only thing is that the only way to get gems seems to be buying them which is just bad. Every currency should be possible to get for free aswell. Right now the gems are just real money with a gem icon.
5 stars: I love it. The only thing I want to say, is it is too easy from lvl 100 and on. I can just tap in one spot and get down to the core in 10 -15 seconds. Devs, you should add hardness to different parts of the planet. Not in layers, but different ...