3 stars: The game is fun but I don't like that when you lose a wave in a level it takes you all the way back to the first wave of that level. If I made it to wave six and then lose, I have to start over at wave one. Its very frustrating. Replaying the same waves is boring. Time to uninstall. I don't have the patience for that. You lost 2 stars due tofrustration. That is a shame because I liked it enough to pay for upgrades.
4 stars: It's fun for the first hour or two, but then the bosses get too unpredictable and impossible to defeat without purchasing upgrades. Along the way, you need to figure out which ads are worth watching since there's an offer every three minutes. I don't understand 90% of the rest of the money sucking icons on the screen. It's a mine field. I'm uninstalling at this point.
4 stars: so far it's kind of fun and interesting. graphics are good. of course way to many ads to get stuff or whatever as well as in game buying offers all the time. is what it is. so far I'm still playing
3 stars: Great game, but can you make walkthrough videos at planet mercury because it seems there is no way to progress without spending money. Watched 200+ ads and completed earth with 9 stars in each level and my lvl 25 3 star blue whale ship barely does anything to aliens, also you need the reflexes of a fly to dodge the bullets in late game
5 stars: I honestly think this is a pretty great phone game. You can invest what you want into the game. There aren't any ...