When you have five batteries, you have to Land and go to the laboratory, they will blow every ennemy ship ans they will send another wave, After three wave there is a boss and then a New level when you fly out of the Room. Indeed, commands are written in french ... To land you have to go back to landing pad ,point up your ship ans press enter. In the second level you can have bombs, that you send with control. I Hope you will try again till level four !