I guess this makes sense. It's a fantastic game that works well in short bursts, especially with its collectathon nature that gives you something to do for a few minutes while waiting for the bus (for people brave enough to take the bus in 2020) even if you're not going to delve deeper into the castle.
On the other hand I can't imagine playing this with touch screen controls. I didn't think it was a super tough game, but some of those boss fights require a lot of precision and while grinding would probably be okay on an iPhone I would not want to play through the whole game that way. If it had cross save to other versions that would make it ideal, but it hasn't been announced, though it does include all previous DLC that has been released. I'm also sure it will be way cheaper on IOS and Android than it was on the consoles and PC, since $40 games get buried on those platforms.
I will say that I wish they'd done a better job fixing up the Switch version, which by most accounts is still problematic. It's not a super graphically impressive game so you'd think it could run well on a system that can handle Doom and Breath of the Wild.
I just would honestly love a sequel to this game. I was just watching the Vinnyvania playthrough last night and it reminded me how fantastic it was. Even with all the jank and the terrible story it really scratched that Castlevania: SOTN itch in a way few games have.
Konami should also put out a collection of all those Gameboy Advance/DS Castlevania games but I doubt they ever will.