I'll give this a shot and report back. Have a VZW Moto G ON 4.4.4.
Edit: No luck here it seems. Once I input the numbers and tapped "Make It Rain", the app simply froze up with the prompt "TowelRoot is not reaponding" eventually poppinng after a moment or two. I could still navigate the Moto G just fine, but TowelRoot stays frozen. You can close it the normal way. I tried using both dalvik and ART. Ichecked for root by downloading SuperSU and opening it, but I'd get the message that no superuser binary is installed.