I'm not nearly as far yet as to decide on beta-testers.
But since I want to upload a level I created before I got converted to Linux, and can't remember which file was the complete one that is also playable in 1.23, I could use someone who would have the time to find out which one it is.
Betatesting it could be a problem, though, since its difficulty level is much like a compressed SCE ( The whole single level can take something around an hour to finish ).