Here are the next goodies we want to add.
PathTools is a low level class of lemmings handling the file operations.
It should be simplified using PathLib.
Beware, PathTools depends on the working dir provided, testing it once or twice is far from a complete test.
File lock in the sandbox
The sandbox could use a file lock system for a safer usage. A small effort to do.
A dumber Lemmings clean
Lemmings clean is purging only a part of the database. It should be more thorough and wipe out all the database.
Tests on sandbox itself, clean and kill
The 30% of uncovered code are sandbox , clean and kill. And tests are a damn good idea.