It started out as an arcade game and was converted to the home formats, where it was so successful that a pseudo-sequel, SWIV, was released. And, as interested as I was, I never got to play that. And that obviously did OK, because another sequel was produced for the SNES, entitled Super SWIV, and that's what I've just played.
Helicopters, as a rule, should stay away from giant lasers. They're harmful.
Given my enjoyment of the original game, and that I was quite looking forward to playing this, I came away a touch disappointed. For one thing, switching the game to a vertically-scrolling shooter has taken away a fair bit of the charm and polish. It actually looks like an older game than the original, which is a bit odd.
As before, the jeep is more difficult to play with than the helicopter. But not in a good, challenging way - more in a weird, difficult-to-control way. That said, given enough practice, I would say it could be perfectly workable... if you hold the button down, the firing locks in the direction you were travelling at the time. I just don't happen to like it.
And so I've been playing Super SWIV as a simple, straightforward shmup, using the helicopter, relegating it to the ordinary. There's nothing wrong with that, particularly... it's a serviceable enough shooty game. But it certainly didn't grab me like the original Amiga version of Silkworm did.