UI is very slow. Every button will take a few seconds to respond, makes the players to be bored and lose the drive to play. Framerate always drops. How can such a simple game be so slow? I play many other games that have lot more effects etc. but the framerate is consistent. PVP is ridiculous, the chat censor sucks, makes players very distant from each other. The gameplay is very limited. You can't play it all day long because energy is very limited. Gameplay is also too simple.