Dead Cells Castlevania Unlockables

Dead Cells on Garuda (Arch Linux).
'Return to Castlevania' dlc for Dead Cells, beating Death (at 0:33:50) and unlocking cool stuff.
Dead Cells Return to Castlevania Bundle can be purchased without DRM for Windows and Linux here:
https://www.gog.com/en/game/dead_cells_return_to_castlevania_bundle