That's a good point - I think it would work well to have sections in which each creature has to use its unique ability to make its way to the goal, or else give the player a way to quickly move all three creatures once a checkpoint has been reached.
Stuff I did myself:
- All of the 3D models/animations (which took up most of the development time)
- All of the code
- The glyphs for each creature (I don't actually know how to use any vector image editor, so I did those in Blender too!)
Stuff I got off-the-shelf:
- The music (by Pizza Doggy - used with permission, with the requirement that I leave the tracks out of the public source code repo)
- The sound effects (with the caveat that I edited/combined them in most cases, but still)
- Things like the lens flare and twinkle textures you see when a capsule is overloading (taken from asset packs bought on Itch)
- The keyboard icons (from Kenney - natch)