Peter, i'm not sure about Hinduism, but i'm really impressed by culture of my own country - Russia, so this rat is mostly about old Russian popular style called "Lubok" - this is where i actually got an inspiration... I'm doing some more complicated illustrations in this style, also i'm learning a lot about Russian traditional toys and ornaments. An Affinity Designer makes this process much more pleasureful )
As to font, its a variant of Russian traditional monumental script, called Viaz'. It appeared a lot on the stone walls of palaces and cathedrals...
Here it says "Belial", as this rat has something demonic in its look, as it seems to me.