I think that's stuff is symbolic (the screen also has a galaxy shot in it) meaning in another galaxy far far away, lives another Vajra tribe and they used to cross dimension once in a time, like the Space Whales.
The ending doesn't make it clear if the Vajra stay or leave, but the human have coexisted with every species before (ok, maybe not the Protodeviln, but they belong in another dimension anyway), so I don't think our Space Bug race will be an exception, plus with them around, no more Fold Faults.
About the poles, you know what, they could be dead Vajra's carapace.