The original NES Metroid is, by far, my favorite version. I can’t really say why, but it is. The controls are...difficult...to say the least. I mean, two buttons...yeah. Making a move from the original NES version to Super Metroid is awesome. Make the move in the other direction is less than awesome.

Same. I couldn’t seem to bomb jump while playing. Bomb jumping on the NES version was possible. Incredibly difficult, but possible.

Yes. It works fine on Retropie.