This app is a vector program that allows you to freely draw vector graphics under hardware that is severely constrained in terms of performance. This program runs best with high-end devices with a fast quad-core cpu and top of the line gpu.
While you draw, keep the above in mind and try to think creatively while drawing to maximize the amount of shapes on-screen. It is best to avoid abusing the tools as much as possible. Instead try to use the tools with precision to keep the app performance from dropping too fast or below the acceptable threshold.
Due to memory and performance constraints, if you reach the drawing limit (usually the amount of vertices that you can add to the canvas), you will see a message at the bottom of the screen stating that you cannot draw anymore.