October 2016
Before the official release, the Vimpire would get KO'd if his his HP hit zero even after beating a target and recovering health. VIMP gains +2/2 when he KOs a plant and attacks again. Now he survives, regardless. A Guacodile knocked my VIMP to zero HP on two separate occasions with his ability (does 4 DMG to a zombie in its lane)and he survived to attack again.
This makes him a little OP because unless you destroy him with a card or put something with more HP than his attack in front of him, he is not going away.
October 2016
The same happened to me. I've lost a couple matches because of that bug. This needs to be fixed.