A few years before this game, they launched .fr-08 [1] which was a 64k demo which lasts 11:01 minutes and renders full 3d scenes, with music, animations, models, text, etc. It ranked 1st at the 2000 Assembly (The Party).
As far as I know, they used the technology from .fr-08 for .kkrieger.
They did :) A lot of their tools can be found on their github profile. Its insane to think this was 24 years ago. I still remember seeing fr-08 at had my mind blown. Seeing the credits across the screen after 5 minutes saying "oh hey we still have 7 kb left so heres a bunch of text" :D And that text went on for another 5 minutes until it finally looped.
As far as I know, they used the technology from .fr-08 for .kkrieger.
[1] - Pouet link: https://www.pouet.net/prod.php?which=1221