You can’t talk of an idle game without mentioning Revolution Idle 2. Amazing simplicity of an idle game of its kind. You are tasked with achieving the highest possible revolutions.
The total revolutions will build a circle which will in the process form a full cycle. You can unlock different colors on the app after you have earned enough revolutions. It is always advisable that you focus on unlocking the highest possible circle first. At last always focus on unlocking the cheapest one last at every time. Always use the left mouse button to upgrade your game. It is the best way to play it!