So I tested multiplayer with my brother (he was remote) and unfortunately it failed. We tried both with and without Hamachi (using the Hamachi IP address that worked in classic as well as our generic IP address a search engine returns). We both tried being the host and connecting to each other and while the frame rate dropped while attempting a connection, that was all we noticed. My game kept crashing during the process, which I'm not sure if that is the result of a failed connection or the build and my machine are not agreeing with each other (.109 has been the most unstable build for me so far).
I'll make a note on mantis too.