Under certain circumstances, performing Eliminator/World Enchant can cause the game application to force-quit itself. It's currently very difficult to fundamentally fix the issue, but there are two ways that may help you avoid it.
1. Turn off your security monitoring application while plaing the game.
2. Go to "settings -> movie settings" and select "off"
Please note that option 2 shortens the visual effects of some Methods like Eliminator, which is not a bug.
The game gradually slows down after you've played for two hours or longer. We're trying to find the cause. If this issue happens, please exit the game and start it again.
That seems to happen in particular situations. We're trying to find the cause.