It barely has any of the features of the MacOS version, there is no shortage of cracks for Little Snitch, and there is Lulu. Other than that, I am not sure.

I don't think it'll have access to the macOS connections, and certainly cannot act at the kernel-supported level as a firewall on the Mac side.

Little Snitch requires packet inspection. If you ran it in a Linux VM, it will inspect packets within the VM. So... kind of useless for monitoring connections on the host.