I've uploaded 0.3 to extras-devel:
* Added snooze button; duration and number of times it can be used are configurable
* For consistent volume, alarm now uses same method as the builtin alarm clock;
To set the sound file, tap status area -> Clock & Alams -> Menu -> Alarm Settings -> Alarm Tone
* Use daemon to start alarm (window can be closed after activating alarm; alarm can't be killed from UI)
* Alarm now activates display