Incoming was also bundled with Creative's 3D Blaster Voodoo2 card BUT it wasn't the full version. They included an early version of the game, and when it was released, owners of the card could send their disc back to creative, and they in return would send back the full game that was released. (Got mine back in just 4-5 days after i mailed it...)
The soundtrack is Red Book audio. (AudioCD) Just place it in an audio cd player but start from the second track.
There is a funny level, where you are in a turret and you shoot at cows... (Hence that weird but great audio track.)
This game was basically a showoff title for the then relatively new 3D cards like the Voodoo 2. It also came as a free packin with the Creative Labs 3D Blaster Banshee, based around the 3Dfx Voodoo Banshee 2D/3D chipset.
For those who purchased ASUS Riva TNT graphic card with TV in/out and 16MB SGRAM, they got this game for free.