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you can move in two ways; around a turret or normal.
you can shield; this will give you energie to shoot if you get hit and won't damage you, but it will damage you if the energy bar is already full.
you can select a turret so you can't miss a shot when you click on a turret with right mouse, this will also make you move around the turret. The turrets can kill you but also the other turrets.

Third-party resources
-soundation
-gamemaker: studio
-Bfxr
-Gimp

Contributors
Us (Regendeer) Which means me and my brother (S & J).