1983 EMM Software (Germany)
by Boris Baginski
Allegedly inspired by the coin-op Tempest, this version plays much closer to any Space Invaders game. And let's face it, without the vortex, you can't call Tempest to any shmup.
As for a variant of Space Invaders this is pretty interesting, if not only visually. But it's pretty playable and addictive too. The keys however, are a real letdown, well at least until you get use to them.
