Like Whack-a-Mole but it's Werner Werman from Cuphead! Whack all the vermin you see. Fun Fact: his name is a play on words because in German it's Verner "Vermin." Did I mention it's very BUGGY?
Thanks to RoboFreaks for the tutorial on how to make a Whack a Virus game. Tutorial here: youtube.com/watch?v=7re_XscMwlc