The gameplay was pretty confusing. I understood that I should destroy enemy ships but it took me a while to realize how to shoot. The problem was I couldn't understand how to shoot, turned out I had to press F to enter firing mod, at the end I think I managed to sink all the ships. I'd highly recommend to add audio feed back for guns. I also couldn't change speed after a while I am not sure if it was a bug or some autopilot mode.