Space Impact GameBoy Beta

I tried to port Space Impact from old Nokia Phones to GameBoy platform. Thank you for any Feedback. ----Controls on webplay---- Up - Up Arrow / W Down - Down Arrow / S A - Alt / Z / J (Fire Weapon) Left - Left Arrow / A [Unused] Right - Right Arrow / D [Unused] B - Ctrl / K / X [Unused Yet] Start - Enter [Unused Yet] Select - Shift [Unused]