While this is your first game (given what I read in the description), it actually looks decent and I think it's fun to play. Now, while there's the ability to automatically shoot, the shoot faster ability is not really needed because I can quickly spam left-click just to kill the viruses and the only limit is the player's clicks-per-second (CPS).
Another criticism is to spawn these viruses not so close to the player because that is how the player dies. I was playing a round with ~2000 points and had several of them spawn very close or in the player's location and lost hearts as a result of it. While you're learning, try keeping this in mind!