Good concept. However, there are two things that caught my attention:
- it seems that the collider is not well positioned. Several times the pices passed over the virus without destroying them. I don’t know if this was on purpose or not, but seems quite off.
- At one point, I had one of the 25 protector just going over and over around the screen border. He was quite inefective.
Another small point is that you need quite some interaction on the beginning to be able to get to the idle point. Maybe starting with some DNA on the beginning can help reduce this feeling.
But I liked it :)