Not relevant to your problem, but GoogleDNS should be applied to WAN interface, not lan and WLAN, where it is reachable from.
Apart from that I don't see anything wrong with your configuration. Evidently from logs the router receives the ssh packet, however it doesn't finish the handshake. You could try to troubleshoot further, however since it is a snapshot, which is unstable, I would suggest to upgrade to a newer snapshot, or even better to the community build.