This is a basic clicker game that is made on scratch. To start off try clicking on the Earth once, do you notice that your planetinos (points) increase by one. Click The Earth 10 times and Mercury will get activated. Click on it and your planetinos will go down by 10 and your planetinos/sec will increase by 1. Now you get 1 planetino every second autoatically. In the same way by buying other planets too you can increase your planetinos. Reach till 20000000000 planetinos and you'll get an awesome reward
This just took half an hour to make but I guess you'll take way more to finish off the game. The code is 100% by me Idea is from the Official Scratch Youtube channel video.