There are actually three versions of this game (Genesis, Arcade TG-16) and they all look a bit similar but have some differences in the levels it seems. I could be wrong but when It seems that when some SHMUP calls themselves 'special version' that means its more options or stuff that is unlocked (such as other game modes) There are a few bonus options here (and i mean there are NO options in the arcade version) such as the amount of lives you have, and an auto-fire.

your vehicle has two modes: ship and mecha. the difference b etween them is a matter of preference: mecha has homing bombs and straight lasers, ship has spread shot and vertical (gradius-style) bombs

Warning: this is one of those shooters where when you die, you dont respawn and you have to 'go back' and restart the level...

Game is super short about 20 mins. most of it wasnt hard, and most bosses are a joke. They throw a final 'well we're not going to let you win' Boss at the end though that makes this probably impossible without emulator.Game looks okay and sounds okay and plays okay too for the most part. It's just very average and isn't doing anything we've not seen before.