Hi paendai, I did some research on the error message you're seeing. The application is not currently code-signed, and the error is saying that your OS is intentionally killing it because of that. I saw online that right-clicking the .app file and choosing Open from the menu (instead of double-clicking it) may help. Failing that, check your security settings, you may have to configure something to allow unsigned applications to run.
In the meantime, I'm going to look into getting the application signed for future releases, to avoid problems like this.