An enjoyable shooting game that would be nicer if it had a password system or something to make it possible to play it in a second moment.

But it's on NSO, so I guess it shouldn't a problem? Well, let's say you had the actual game's cartridge and you would love to play it all the way through.
I don't know if it has Game Over or a continue system where you would miserably have to restart all over again.
Guess I'll have to play it more to find out.