Played the game. virus and balloon are there, but I didn’t really see their point, sorry. That said, the idea of a survivor-type game with a virus twist could be really interesting!
A few other concerns: the coins popping out on the left side feels a bit weird. it would make more sense if they popped where the enemy dies. Also, the game could use some balance; after getting the fire rate upgrade once, I didn’t even feel the need to move anymore.