Real nice effect on the music! :)

Music stopped looping and then no enemies spawned for like 5 mins.  Boring and buggy.

antivirus... no, the debugger corrects errors in the program))

Nice one! The music keeps getting faster as you pick "speed up" if I'm not wrong, it increases even the sensation of the game speeding up, very well done.

Fighting the infection one bullet at a time.

Fun shoot, great job.  

this is very good, I can see myself playing this for hours :)