The gameplay is fun but the exp system is really bad. First you have to use the tower to get exp to unlock upgrades then you have to buy the upgrades in game. The gameplay is super fun and strategic but how much strategy can one craft with only low tier upgrades? And the game is also unplayable for mobile players after round 30. By the time you are able to press a button the ddts are already at the exit. The game is really fun but after round 30 it's unplayable