Why cant you shoot missiles vertically in Metroid Fusion im playing with Visual Boy Advance?

In Metroid Fusion, you can't shoot missiles vertically because the game design restricts missile firing to horizontal directions when Samus is in a standing position. This limitation is a gameplay mechanic to encourage strategic movement and aiming, adding to the challenge. Additionally, the game's controls are designed to balance the use of regular beams and missiles, making players think critically about their combat approach. If you're using Visual Boy Advance, this restriction is part of the original game's design and cannot be altered through the emulator.