(By Obscure Gamers, of Terarelease fame. apparently the owner of the site switched, and said owner wants to do releases again.)
so this is a bit of a legendary collaboration that never made it out there, it was being created by Manfred Trenz (hired by Similis on October 2000) and Andreas Escher. the team who previously made classic titles like the Turrican series over at Factor 5. (pssst, come here @Koren Lesthe )
"Katakis" was one of their earliest titles they made, a horizontal shooter that was fairly similar to R-Type. to the point that the company that owned the home computer rights to the game at the time eked out a deal with them to do an official conversion on Amiga.
as the title suggests, they brought the game over to the third dimension with proper forward scrolling. using various cool visual tricks such as pre-rendered backgrounds and massive boss sprites.
for the musical end, they brought over a guy from the C64's demoscene of the time. Tufan Uysal.
under the name "SoNiC" he was working under the group Smash Design, with his experience with the SID chip being put to use by having him initially compose the music on the Commodore 64 before converting it for play on the Game Boy.
despite having such an incredible team on-board, the game failed to find a publisher. and the team sadly went their separate ways.
Manfred would go on to found Denaris Entertainment Software, who you might recognize for the Mario Kart XXL demo that got out there a few months ago.
while Tufan would continue working with the C64. the team at Smash Designs would go on to release a homebrew port of Turrican 3 in 2004. which actually reuses some of the tracks originally composed for Katakis 3D amazingly enough.
one of the prototypes for the game would eventually find it's way to one of the Digital Foundry guys (Audi, specifically) who would stream it on Chris Huelsbeck's (composer of the original Katakis) Twitch channel in 2015.
and now said proto is publicly available for download if you know where to look.