man what a cool concept! I remember starting to work on a vaguely related idea back in the day, but you were actually the virus so I feel like I've met the other end of the stick haha
If I had to give some constructive feedback, I think I would first start by maybe considering more "docking" stations along the path, so you can tactically decide where to stop that's not a single spot (like "oxygen terminals" if you will). Then maybe it could be interesting to see the viruses pop out of walls, chase you for a bit and then fade out, adding some tension every now and then, but that may require a different control mechanism or a slower, more methodical pace in general. Something to explore!
good job on making a game! I hope you get to explore the idea a bit more :)