So the work in progress finally resembles a game, I think.
I’ve decided to go with a vertical shooter. You’re an antibody going through the bloodstream. You’ll shift forms as you collect antigens.
It started as a much more ambitious companion game where your block companion could shapeshift (a well-worn mechanic!) and allow your other player to make it to other areas, etc.
AN example of the companion/shapeshifting idea is below. What was I doing here??? The blocky character was supposed to shift, but I scrapped this due to complexity. I wanted this bot to be able clone itself to serve as a platform or bridge, etc.

Okay, so a shooter through the bloodstream seems more doable…

And “improving” the graphics marginally…

Now to make it more fun to play, and add the actual shapeshifting. I am thinking only the player/antibody will shift (complete with some stronger shots/etc), but I might make shapeshifting enemies too if I have time…