I had no idea this game was old, I just discovered it recently and it feels so fresh that I would have sworn it was a new release. Also surprised that I've not heard anything about it before, it's one of the nicest iOS puzzle games I've played. If people are on the fence then there are two free versions out for it - Lite and Headache.
It's a clever colour-based logic puzzle where you aim to remove all the virus cells by releasing the corresponding vaccine colour into the rooms containing them. As with all the best puzzle games, you're slowly introduced to the mechanics before being dumped into some pretty devious machinations.
Liking the presentation too, though a Universal update would be greatly appreciated. It reminds me somewhat of Evacuation, another really cool niche iOS game that I really enjoyed only this time you have hair-pullingly tough colour puzzles to contend with rather than the vacuum of space.
Anyway, I really recommend this and with a couple of demos to dip your feet into hopefully this will get a bit more attention.