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This is the original Factor 5 Demo-Disk of Turrican 3. It was sold for 5 DM at a computer-show in Cologne - and it contained 3 Demos.
One of the games, Neutralizer 2, never was released, but there are some funny things about it:

It uses ingame music and sound of Z-Out and is a little Defender-Clone. Nothing big, but made quite well.
As everone knows (of course) the Z-Out sound was done by Rudolf Stember, but read the credits below !

So, I guess, Inbetween Software is just a gag from Factor 5.