Ok, i tried again:
I believe that the error is happening when i assign my left mouse button to shoot. It seems like there is a split second where the menu opens up, since i am still holding down the left mouse button, it restarts again and again.
I just set shoot to space bar and the error is gone. How do you open the pause menu? Maybe display which key that is or let the player assign:
Forward
Backward
Fire
Menu
Also, when i start playing, i always have to click once to make the cursor appear.
What do you mean by "DO NOT set your controls to any of the scroll actions" ?