5 stars: The goal of most mobile games is to get as much screen time as possible. Most do it by quick dopamine hits. This one does it by being an actually good game! The ads aren't too intrusive to the gameplay, and the gameplay itself is challenging and engaging. The on-rails 2d shooter genre doesn't get enough service in modern times, and I'm glad to see that this one respects the long heritage of the genre!
4 stars: I previously gave this 1 star, as you couldn't remove the ads, and they were baked into every aspect of the game. They happily added a one-time ad removal charge, and now it's a joy to play! This is a really slickly designed game, with perfectly polished visuals and music. It still annoyingly tries to squeeze extra money out of you, and I'd like to see more weapons, but it's really fun.
4 stars: It's ok, but it gets boring after 400 levels. Nothing new, no new viruses or weapons, and the levels gets easier and boring. Few bugs with ads, you're forced to click 3 times to close it, and sometimes you're forced to watch them again and again, otherwise you cannot continue.
3 stars: Decent game and it was quite fun up until the later levels and you just hit a brick wall. The difficulty becomes almost impossible without dying over and over and over and over and over again to save up for enough upgrades to do a TINY bit more damage. It becomes a grind instead of a challenge.
3 stars: Addictive Game - would give it a 5 stars but sometimes, I can't watch ...