There were a lot of false starts and many attempts to get Spaceratops up and running properly, as I was just learning how to use Java Web Start this morning. But now, it appears as though you can follow this new, semipermanent link to the launcher. Click the Launch button, open or save the file, and then wait for the download to complete. After the download is done, the game should launch automatically (and you only need to go through the lengthy download process the first time you launch). Also, here’s the slightly updated source code if you care to view it.
As it’s turned out, this project has come right down to the wire. But it appears to be pretty much complete and working right now (knock on wood)(actually that’s an exaggeration, the leaderboard is broken, but I’m working on it). Anyway, have fun playing it in a form that is much more likely to actually work for you. Thanks for reading.