The maximum bet will start you with the maximum amount, while autoplay only means that a certain number of rotations will be triggered. That's all there is to it, let's take a look at the subject and graphics of the title, and which symbols give you access to which areas of the trench. This is a maze, so the more you know, the better.
All you have to do is take them out as much as possible and your total will continue to climb. Although you don't need to have specific skills, it's always good to have a decent goal.