PS4/5

Dead Cells on the PS4/5 is shipped as a signed PKG. Inside of the PKG, there are native interfaces for all trophies (achievements), alongside a SELF (Signed ELF) binary that acts as the main entry point (eboot.bin) and the obligatory res.pak, which seems to be V0 but could possibly be V1.

eboot.bin

This file, as previously mentioned, is a signed ELF that contains the HL/C compilation of the game. Sadly, this ELF does not contain DWARF symbols, or any other means to recover information so it's most likely impossible to see what's changed for PS4/5 in specific.

res.pak

Mostly unremarkable, you can unpack this with any standard PAKTool or its forks.