Some of the older artwork still says Jetpack 81. That was the project’s earlier name, before the adventure became Outpost 81. Those images are part of its history, rather than current branding.
The crew, in an earlier frame.
The recurring visual thread is the clay style: rounded shapes, textured surfaces, bold colours and slightly odd proportions. A poster or design board can take those ideas further than a small sprite that has to stay readable in motion.
Historical artwork. Earlier titles and character designs are retained as archive material; they do not replace current game identities.