I think the UFO would be like an asteroid, but it would try to move away from you. The shooter UFO would shoot slow-moving lasers at you. The commander UFO would try to shoot you with a variety of attacks.
All vector art by me. Idea for the mothership by @purple_official. You don't have to credit me for anything you use, you don't even have to use this! ;) Oh my gosh you will not believe how much time I spent on the art alone. D:
