Love your concept. I totally considered using that type of virus as a protagonist in a game but couldn't come up with a good game loop. I totally couldn't hit 2048 in the second game and gave up after failing to reach 512 several times but I thoroughly enjoyed playing your game! I think if you polished up the virus movement and a few other things (a life bar would be nice as I couldn't tell how close I was to death except when I was flashing).