The game is fun but their rewards system sucks. Coins are the "main currency of the game" yet after playing a month I have 2 million coins and nothing to spend them on and I still can't get my ships where I want them because I need gems and cards. They have "free rewards" where half the time you're trying to watch an ad but it says unavailable. Their event prizes are basically impossible to get without buying them. It's just a huge cash grab where you can't be good without paying lots of money.