What are the differences with this version? https://www.gog.com/game/corpse_party
Taken from one of the devs on Steam:
The old Steam version is from the original Corpse Party devs, an indie studio called GrisGris.
-Indie art by GrisGris, the original devs.
-Indie voice acting by different voice actors than later games/releases. Voice acting is a little spotty in early chapters
-No CG artwork for Wrong Ends and many other scenes, descriptive text instead
-4 Extra Chapters, including "Tooth" presented in RPG style instead of Book of Shadows style
-A couple of different/extra endings in Chapter 5, if I remember right
-A couple of GREAT vocal songs that are completely missing from later versions.
-Steam version is available for Windows and Linux.
The 2021 version is from mainstream developer MAGES.
-Art by MAGES. which matches Book of Shadows, Blood Drive, etc.
-More-or-less full voice acting by the same actors as Book of Shadows, Blood Drive, etc.
-Much more of the voice acting is binaural.
-Redone area and sprite graphics at 1.5x the resolution
-CG artwork for many scenes and pretty much all Wrong Ends
-16 Extra Chapters (Tooth is not one of them, but the other 3 from the old version are there)
-An Omake "Chapter" where you can view many of the CGs
-An extra Wrong End in Chapter 1
-An opening video
-Different (not remastered) music for a few scenes or locations
-A couple of its own unique (and very good) vocal songs
-Steam version is available for Windows, Linux, and also Mac.