I've gotten that request from quite a few people now and am looking in to ways to add that functionality to the alarm while preserving the overall idea of setting meaningful alarms with consequences. The reason behind the single button initially is that it forces you to consciously set your alarm which I felt would increase commitment. I completely understand that it isn't for everyone so am working on the multiple alarm / repeat support options too.
Probably like this: let the user set the repeated alarms (like, Mon-Fri at 9am, Sat-Sun at 10am), yet the user is required to "confirm" the alarm each night if he/she really wants that alarm be effective. This way, the user can avoid the tedious "keep setting same alarm" each night, and the "conciously set the alarm" thing is still there.
That's an interesting idea. I've added it to the Trello board of ideas I'm considering for recurring alarms and appreciate your suggestion.