Yeah its pretty fun! I like the effect of “running fast” 
I think the graphics are cute and really nice. The music is great too!
As far as the gameplay goes, I’ve found it a little bit hard to judge the right distance to attack. In other words, I’ve had problems with dealing damage, while avoiding damage myself, even on 1v1. It’s not exactly clear to me, how the virus attacks.
Edit: Oh and the fps was consistent 60, so that’s pretty nice 
However it seems Ive encountered a bug. Basically my first run was great, I died, and after respawn, I jumped down as intended, but I fell through the body and died immediately. After my next respawn, I noticed Sars-CoV doesnt deal any damage and neither do I (although me and the virus could still move). I opened the console and found this:
Testing machine: Windows 7, Nvidia card
Browser: Opera ver 68.0.3618.125 (up to date)
Hope it helps 
Overall, pretty great for your first game, good job!