First off, I wouldn't worry about the art style - we thought it was gorgeous! Simple, but really legible as far as the mechanics were concerned. It's a little whimsical for a theme that could slide toward darkness.
The gameplay is very simple and your rulebook lays out everything exceptionally clear. The only bit that could get lost is how the game begins - each player secretly looking at one face-down research card. This detail is right at the end of set-up. Might be better to have in the gameplay section.
Where the game is quick, we found it a little too quick. Though if you're targeting a younger audience, this might be the perfect length. Depends on your goal! We also felt it was quite easy to determine the true solution (in a two player game), even when one of us (me) has a terrible memory. The fact that the other player's board is visible played more of a part in deduction than our own boards. Have you considered making the lab boards bigger or adding another layer of virus qualities?
As many others have said, this isn't a co-op game, but I think it would really interesting to explore that possibility. Each player adding a prospective tile to a larger central board based on what they know. This may lead to interesting interactions such as "why would they place that there? What are they trying to tell me?" Or whatever you feel. I think the possibility is there!
All in all, the game's table presence is pleasing and the gameplay is tight, but I wouldn't shy away from complicating it.
Well done!