Wow! I rarely see a game made purely in HTML and JS so I feel this is quite impressive in and of itself.
I like the detail on how the cells get converted into virus cells upon contact (I also hate it because that's when I usually lose)
Although it took me a while to realize that you lose the game if a virus cell reaches the bottom, so I was confused for some time wondering why I seemed to be losing randomly.
Thanks for making this game!