5 stars: This is a 5 Star Game, it's absolutely fun for anyone who's looking for a good time, sure level 100 was hard, but I eventually beat it. This is an amazing game! I'd love though for no ads as they annoy me. But besides that, excellent game! I recommend it for everyone!
4 stars: Great game. Really fun, cool artstyle and the graphics are nice. But there are WAAYYY too many ads. Complete a level, ad. Want more money, ad or wait. Want to upgrade, no, ad. It brings the immersion down and it has gone from understanding that the developer needs money to just being very annoying.
3 stars: The gameplay is good, I like it but I dont like that after every level you complete you get a AD. Not only that but you cannot even upgrade your plane without being forced to watch an AD. I understand that the game needs to make money but cramming Ads in every possible spot is absurd.
5 stars: Simple, and it's offline, I like it. Only problem so far is that the Ad system stop working... Am I really complaining about the lack of ads? Yeah. I upgraded the Attack stat with an Ad, then I couldn't do the same with the Offline Earnings or Armor stat.
4 stars: This game would so much better if it were not so hard. This may sound like complaining but some level are ridiculously hard and you can barely even win without ads. Play it and you will see. But otherwise it is good.
5 stars: This game is exceptional. But I would suggest some co-op play and boss raids, teams/guilds, skills...