Could use more depth
-At first I wasn't sure I was going to like this because each level seemed to be pretty much identical to the last but only with a few more virus pieces. However, when I hit around level 26, I found that it was really pretty addictive and challenging! I really like the graphics you did for the antidote drops especially when they get really big.
-I could totally see this game being expanded to add different kinds of powerups and different virus pieces. Heck, even making the board bigger or adding maze pieces in it would add some neat flavor. Have you thought about adding a timer for each level as well? That way it gets more challenging even if you're being very careful with how you administer the antidote. Overall it's a good game but it lacks depth.