1. In case you find things too dark, press the 'F' key to turn ON/OFF the flashlight.
2. If you are lost or do not understand what to do in the forest, press the "M" key to display the HOLO-MAP. This will show you a simple path to follow to your objectives. Remember, the path displayed is a straight line in the map, you might have to zig-zag a bit.
3. Also remember to look for & read / listen to the HOLO-LOGs. They will inform you about your OBJECTIVES and options INFO section. You can view / scroll / listen to these logs separately by pressing the "O" key. Press "I" to turn off the messages.
4. Find your way to the upper levels on the trees from the ground. There's a lot more action and different enemies up there!