But on the other hand, hacking something in there for endless testing might be an idea. But still, I'd like to stick to the game as is for now and concentrate on the content. And the next major release will add another map.
If it doesn't take long to put in, it would be great to have for now. Maybe a "Continue at the beginning" button at the "First Access" end screen, and your character gets plopped back into the 1st map. Dunno how much work that would take. If it takes a significant time to implement, then it is probably not worth it for you.