Turrican is a 1990 video game programmed by Manfred Trenz. It was first developed for the Commodore 64 by Rainbow Arts, but was ported to other systems later. Turrican 3D was intended to bring Turrican into the third dimension in 1999, but it was never released because publisher THQ stopped the development. Screenshots and videos show how the world of Turrican would have looked. In an interview, Manfred Trenz (co-developer of Turrican 3D), stated that many members of the project were far too profit-oriented, and the project failed as a result. [Info from Wikipedia]
Thanks to Celine for the contribution!