icon to enter fullscreen and press Esc to exit fullscreen. So now you select wich level to play. Now you need to hide your cursor, do so by clicking the game window, press Esc to show it. Note: if your cursor is hidden and you are in fullscreen than your cursor will apear and you will exirt fullscreen.
Look around with the mouse. Move with wasd W is forward; S is backward; A is left; D is right. Now you should be able to move around, and look around. You may see some bottles, you pick them up with left click. You know you are holding some trash when you see the trash on the left side of your screen. Now look for a trash can, once you found put your trash in the can by clicking on it. Now the bar on the side should fill up. Yay you know how to play my game. When that bar is full you finished the level and will be brought back to the level select.