Best game I have seen since Raiden, but... Ok, all hands up for the original design of certain level mods, the graphics, the weapons variety and the bosses variety.
The overall gameplay is fun, very fun for the first couple of days, but all that comes to a full stop after you max your 2 available standard planes and addons.
After 2 weeks of play, I have been able to unlock 2 basic planes and basic support weapons on the 1st day, and that was basically it. Impossible to get any other planes or upgrades without paying a hefty amount of money.
The pace of the game and progress becomes completely dull as you will feel the levels have almost the same enemy planes and mini bosses.... the big bosses are still fun though. And ones you get to the hard levels you can’t go far with them basic planes and upgrades, so, honestly, the game developers are too greedy as they only want milk the players: 1-with frequent and very long ads (why not chose the short ones), but give nothing substantial in return. 2- absolutely hilarious prices for in app purchases. I would NEVER buy an in-game plane for150$... for just one plane, and the list is long with expensive but useless items.
Briefly, this is the best game for those who have a golden egg laying chicken and worry not about wasting money on a game.