There was some interesting design here. Trapping viruses to destroy them, but having to deal with multiple different kinds of viruses that multiply or explode stuff - cool idea. Unfortunately I think a lot of people will be confused by the gameplay since players are thrown in with little clue as to how to win. Running into viruses clearly destroys them, but by the 2nd level, if this is your only strategy, you die.
I got to level 7 then found coralling the viruses a bit frustrating, as sometimes it would simply depend on them moving to the right spot for me to trap them. slowing things down made the game easier, but less playable. Add to this the fact that my game crashed every time I lost, and that just added insult to injury and made me less inclined to keep on trying.
Some adjustments might make this a really interesting game. Work on the learning curve/tutorial, fix things that make the game crash would be a good start. Some people might totally love this kind of game if it is polished up enough.