There are two bugs. A lagging issue, and a crash upon closing the game. The crash does not impact the game to my knowledge.

The yellow square in the center of the map starts the storm. Other yellow squares give you rift points. When you get eight of them, you win. Falling under the map kills you. Before the storm, you can complete two challenges which give you rift points and powerups. During the storm they disappear. Rift points are then randomly generated.