Ah, I see--of course! I hadn't thought of its tile-based approach as--indeed--incurring the presence of a number of assets. Fair enough, and thank you for the explanation! ^_^
And thank you for confirming that Panda3D should be okay--and indeed, it has no such requirement, I do believe. ^_^
(The only caveat that I'll mention is that I believe that it handles text by internally rendering the glyphs of a given font to a texture. I'm hoping, however, that this might not count against it in this jam.)