Ads...
I understand its difficult to balance free to play games, but for me the ads killed it. You get chest after each mission, maximum of chests you can have i think is 6 + 1-2 daily ones. Each chest have a timer you can speed up with gems or watching an ad. Then you open the chest and to unlock extra 2 rewards (3 rewards and 2 locked per chest) you either watch another ad or pay gems. I personally never ever buy gems, because i hate that system because it ruins the natural feeling of progression in games. So, when i A. Play for the first time after a break i get to watch 6 ads, and B. Want to keep playing but got my chest slots full i get to watch 12 fudging ads! Considering most ads are the infuriatingly long 30 seconds, its either 3 Min for the first play of the day or 6 min when my slots are full (speed up + unlock ads per chest). And i dont even know if later chests are hours long...which means it could be more than one ad per chest + unlock reward ad... Game with potential but as it is, its yet another good game ruined by freemium model