📄️ Switch (NX)/Switch 2 (Ounce)
Because these platforms are cross-compatible (to an extent), they're lumped together here. Assuming you have a title.keys and a prod.keys dumped (😉) from a Switch, you can extract both the game's main (a custom-format NSO executable) and its res.pak with NxFileViewer.
📄️ 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.
📄️ Xbox One/Series X/Series S
Unfortunately, I'm unable to find a source that allows me to legally obtain the files for Dead Cells on Xbox. If anyone owns an Xbox with Dead Cells installed, please send me a DM on Discord @n3rdl0rd - let's figure this out!