Ok, firstly, have you found a started the drill yet? If not, head left to see if there's a way to push the button to start it. Next, without the sword that is usually found on level seven, you cannot kill the enemy circling the red battery. You have to quickly connect the red battery to the rail switcher, then hit the lever quickly before the enemy destroys the connection. After that, grow the tree in the ink to clear it, then use the green battery to power the drill. Activate the drill, and the rest should be obvious.