Have 5 options on the menu, Standard, Custom, Special, Options, and Exit.
Add an option to enable the ability for the player to shoot mines.

Known error: since mines are smaller than the player ship, mines will warp
               to the other side of the screen faster than players. If they
               get there before the player, they kill the player.
               - Gotta give them both the same buffer space.
Known errors: game does not listen to the reverse_rotation or
                enable_shield_recharge variables.

August 4, 2017 - Added smart mine movement.
               - Mines spawn faster on game start.
               - Mines with Smart Movement Enabled do not move faster
                  than the player.
                    (non-smart mines still do move faster than the
                     player, but there's no way to disable smart mine
                     movement yet.)
               - Adjusted Standard Game stats.
               - Fixed text errors in the Custom Settings menu.
               - Fixed error when number of shields = 0.
                   - Also, now when there are no shields, you can just
                     ram your ship into the mothership to destroy both
                     the mothership and yourself and win the level.
               - Fixed menu cursor out of bounds when switching from
                   Custom Settings Menu to Main Menu.