Having a buddy in a platformer is an interesting idea. I'm curious. Is there a narrative for your game. Who is Nina? Who is that otter guy? who is the machine? Is the machine my friend?
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Yes! the Alien is just another worker, collecting coal for the company. The cute machine, Nina, turns that coal into diamonds .... though at first the Alien sees her only as a machine. Like Wall‑E, she has a heart, and in a polished version their bond would grow. The cyber-Mole is the troublemaker, always stirring chaos. Level 3 should feel like a mine, though for now the jam prototype uses a simple, generic background.