While specific detailed bullet points for this exact sub-version are often grouped into general stability improvements, this phase of updates typically addressed:
: Correction of minor asset issues, such as clipping or placement bugs that appeared in the early access build. Context of this Version V.Rising.v0.5.48238.zip
Version represents the game's Early Access state before the major "Secrets of Gloomrot" (Update #1) or the official 1.0 launch. If you are looking for specific gameplay features like multiple castle floors, the new Gloomrot region, or gamepad support, those were added in later versions (Update 1.0 and beyond). While specific detailed bullet points for this exact
Update #1: Secrets of Gloomrot – Patch Notes - Stunlock Blog « the new Gloomrot region