There's a little thing at the very end of this video. You'll see. Doctor comes and challenges them to a fight, but you could make whatever happens in that part. If you want, press 'space' to shoot, but there's really no use because the character automatically shoots the enemies anyways. I just decided to add that little part to occupy you guys with some fun. Really, it's meant to be watched, not screwed around. If you want, you can.