WonderThunder has archived the entirety of Castlevania: Grimoire of Souls in an offline capacity, uploading their work to The Internet Archive. Currently, the game can only be played on macOS, but WonderThunder suggests that Windows, iOS, and perhaps Android versions will be available in the future, preserving one of the smaller pieces of the Castlevania continuity for future generations. Stellar work.
Seems like that version of the game (2021 enhanced rerelease without microtransactions), was only on Apple Arcade, so it was already iOS/MacOS exclusive to begin with I assume.
I’m hoping they find a way to emulate/translation-layer it to PC though, it looks interesting.