Use the toolbar at the top to place blocks. In order to make a level, you'll need to place the Spawn and at least 1 Moon.
You can rotate the camera with Ctrl + Left Click or with Right Click.
When you are done, click the Play button in the top right corner!
Move around with W A S D.
Jump with Spacebar.
Collect every Moon to win!
P.S.: Every 10 Coins you gain an extra life!