This is
a straight arcade port.
Not exact matches
Straight ports of the
arcade version are also found on the US versions of the Orochi Saga.
Still, it's a
straight port of the
arcade release, and seeing as in 2015 (or whatever year you are reading this) the game can be found for dirt cheap, why complain about a lack of content?
The PlayStation 2 release is just a
straight port of the
arcade version, so it's missing the bonuses from the Saturn version except for the rapid fire, plus the visuals are interlaced.
I made the mistake of hopping
straight into the Saturn
port of the
arcade version, which on normal difficulty and a 4:3 playing area was nothing short of torture.