The controls are pretty straightforward. Basically, seven simple icons take you into various menus which let you design, build, and order your troops around. Designing your own units is a real treat. As you progress along your research path, more and more goodies are added to your pool. When you push the design button, you assemble a prototype from your pieces.
Wheels can be things like actual wheels, half-tracks, hovercraft or flying machines.
Chassis are essentially armor and can be made of several materials that vary in weight and strength combinations. Turrets can be machine guns, missiles, flame-throwers, howitzers or command modules for leading other machines in battle. You can create literally hundreds of different machines any way you like. Of course, some combinations work better than others, but Pumpkin Studios did not expressly explain what each improvement is good for. Graphics Graphics are pretty good.