The Beginning of Ivan TAG Development

So my very first arbitrary game jam started last night at 3am local time. Despite having to be up for work at 6 I stayed up until the theme was announced. The three themes we have to work from are "scarletina," "biodiversity," and "anabasis."
I woke up this morning and did some pre work shower brainstorming. I wanted to go with scarletina because of how easy it would be to incorporate color. A game based on such a huge visual indicator such as something turning red could be eye candy. As I thought about it I moved toward anabasis. A simple tower defense game would be within my solo jam scope and wouldn't require anything too extravagant. No enemy AI, no arduous animations, and no collision detection if I didn't want it. The more I thought about it the more I sold the idea to myself.
It takes me an hour and half to drive to work each morning and so the brainstorming continued on my commute into work. I thought about how to break the game down into steps to ensure I came out with a completed game at the end of the weekend. I thought about incorporating scarlet fever into the design. The waves of enemies could be bringing scarlet fever to your city and you must stop them from entering or risk plague. I was pretty happy with that idea. I could incorporate two themes into a game that would be simple to make.
As I pulled into work I had another epiphany. When I think about having waves and waves of infected soldiers pouring into your base I think of Zerglings. I started to think of Infected Terran and how the Zerg relate to biodiversity. Then I thought I could have the player play as native animals to an island that are defending it from these scarlet fever zerg-like enemies. The scarlet fever in this case would homogenize your gene pool (your new base that you'd be defending). This way you'd play as nature defending a literal gene pool from a homogenizing plague called scarlet fever.

The final game concept is... 
Playing as nature, you must plant various shrub, pod, and flower towers to defend your gene pool from the encroaching plague of homogenization called Scarletina.

I'll upload some scans of my design notebook later.