Thank you for your feedback :) Yesss, you give an important point, it should have a better indication about the virus health. It got 5 health actually (5 shots). I had that in mind to add enemy health UI, but at that time I found a new major bug in the core mechanic, then I totally forgot to add the UI.
Btw, are you RubberDucky in the discord group? Thanks for your info about jfxr, all of the sound effects in this game were made using it. And I think it turns out to be good :)