Right, an overview of physics changes (versions and release dates) is occasionally useful for level archaeology.
A covering replay merely shows that the level is solvable, but it doesn't necessarily show intent. E.g., Six Gaps, Five Builders, it may have become easier after we removed builder backstep.
For now, you can cobble the physics changes from
the C++ Lix history,
the D Lix history.
In 2010 and 2011, I didn't document the history entirely. This was the year of the redrawing towards free sprites and I didn't release Lix for months until it was free.
-- Simon