Brace for the cease and desist order from Blizzard lawyers.
You’re not only using Blizzard’s intellectual property so there’s a DMCA/Copyright strike right there, but you’re using assets ripped from the game, which I’m sure is against their EULA, and if I recall correctly is against the EULA for UE4 as well.
They’ve been staunchly protecting their IP lately, so if you gain any traction or popularity at all, they will shut you down. Free or not.