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   

Left - Left Arrow / A   

Right - Right Arrow / D  

 A - Alt / Z / J   

B - Ctrl / K / X   

Start - Enter   

Select - Shift