Silpheed

Silpheed is an arcade game that was a cross-platform hit. It is a 3D space game, with two distinct levels: flying through space, and flying through a trench (similar to The Force). It was much more complicated (and faster paced), as there is all kinds of power-ups that you can get to increase the capabilities of your ship, including shields, various weapons, and more. The Coco version was on a "fat binary" cartridge that contained both the Coco 1/2 version, and an enhanced Coco 3 version. Unfortunately, due to the decision to make it one cartridge, it had to be severely reduced in size to fit (both versions had to fit on one 16K ROM), and a lot of the extra features that the DOS version had are missing in the Coco version.

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