The macrophages multiplying (In gameplay) was my original idea. But I started to learn unity like 2 days before the jam, and couldn't make it work in time.
And I would say this is not a top-down shooter, I think it's more like a puzzle because you have to find the shortest path to find the viruses, kill them, recollect all the data and do all of this before you run out of time. Shooting in this game is more like a side-decorative thing. But don't worry I know this is not the funniest game.
Make sure I will give a try to your game.