By moving the mouse like you would in a first-person shooter, you will be able to look around.
If you look down, you will notice a small white sphere on the terrain in front of you. This cursor is your means of control and movement.
If you press the right mouse button and then move around, you will notice how the cursor moves in different directions. You will notice how moving the mouse left and right rotates your point of view and makes the cursor circle around you, and moving it back and forth moves the cursor towards (or away from) you.
While you were looking around, you will have seen that there are many trees within the landscape. These are for you to take to build up your energy. We shall start by absorbing a tree.
Now look at the tree and move the cursor towards it. Ensure that the cursor compenetrates part of the tree. Now press the left mouse button. You will see the tree disappear before your eyes. The tree, or at least the energy, still exists. If you look to the number on the bottom the screen, you will notice that it says "011". If you noticed this section before, you will remember that it used to say "010". This is because the energy of the tree is now part of you.
Now that you know how to absorb an object, it is time to create an object. From the starting position, look around the landscape until you find a horizontal patch of land that doesn't have anything on it. Then, with the cursor on the target square, press the 'B' key on the keyboard. A boulder will appear (well, it looks more like an integrated circuit, but we're calling it a boulder anyway). Now press the key 'R'. You will see a Synthoid appear on the boulder. You are almost there.
Now press the the key 'Q'. The camera will align with the Synthoid you just created and it will move towards its head. When it stops, you will be able to look around again. You have just transferred into the second Synthoid!
When the transfer is complete, you can turn around and look back at your old Synthoid. Absorb it as you would a tree and your energy level should be the same as before you moved into a new Synthoid, but because you are also standing on a boulder, your position in the landscape will be higher. Because of this higher position you will now be able to see much more in the landscape; more trees to absorb, more positions to move to.
The goal of a level is to absorb the Sentinel standing on its platform, create a new Synthoid shell in its place and then hyperspacing to a new level, which you do by pressing H. Note that if you jump to hyperspace when you're not on the sentinel's platform, you'll reappear in a random spot of the same level.