The oil refills too slow also limited, coin rewards are too little granted it's also hard to obtain, again limited. some Elite/SR ships are useless than rare ships, also the accuracy of the shots are horrible almost as bad as XCOM, better equipments are hard to get, moreover expensive. Ambush are too frequent, granted it's near impossible to escape also ammunition are limited. Events are for deep pockets, drops are worst. NOT F2P Friendly why? coin and exp mission rewards are near nonexistent.