You might not understand the controls but I opted to make the startup process one key.

The first "s" press is to start accending out of the chamber.

The second, third and fourth "s" press is rotating left.

After those press "s" again to start travel

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Hit the boxes to the left

After impact you will be able to move the camera freely with "a" and "d"

Sometimes the missile will rotate in the chamber, I don't know why