Hey - just wanted to post my dump of Outback Joey. You'll need a new-ish nightly of BlastEm to play it, as it requires emulation of the HeartBeat Trainer peripheral. The peripheral controls are mapped to X/Y and Z/C on the six-button controller.
No - that's actually the author of BlastEm who (at the same time as me) acquired a copy and did the actual work of reverse engineering the game's custom peripheral. I just bought a copy and it happened to be at the same time. He's been sitting on it, (I think he just needs to write a bunch of changelog stuff for the next 'actual' release of BlastEm) and I confirmed that he doesn't mind me pointing out the nightlies as the way to play the game.