Its a good game but the amount of ads that you have to watch to get some free stuff is horrible. Once you do get enough gems to buy a good ship it takes forever to upgrade it. You need to gems to unlock pretty much everything. Rewards for placing in the top 3 for the hunter/adventure stuff are paltry and takes a long time for them to reset. Only way to get ahead in this game is spend a lot and I mean a lot of money.